using System;
using System.Linq;
using System.Collections.Generic;
using System.Text.RegularExpressions;

namespace Portal
{
    class Portal
    {
        struct EndPoint
        {
            public int Row;
            public int Column;

            public EndPoint(int row = 0, int column = 0)
            {
                Row = row;
                Column = column;
            }
        };

        static void Main(string[] args)
        {
            int matrixSize = int.Parse(Console.ReadLine());
            List<List<char>> matrix = new List<List<char>>();
            string patternMatrix = @"[SEO]";
            Regex regexMatrix = new Regex(patternMatrix);
            string patternLetter = @"[DURL]";
            Regex regexLetter = new Regex(patternLetter);
            bool isPath = true;

            int startRow = 0;
            int startColumn = 0;

            List<EndPoint> endPoints = new List<EndPoint>();
            //int endRow = -1;
            //int endColumn = -1;

            for (int i = 0; i < matrixSize; i++)
            {
                matrix.Add(new List<char>());
                matrix[i] = Console.ReadLine().ToList();
                if (matrix[i].Any(x => x == 'S'))
                {
                    startRow = i;
                    startColumn = matrix[i].IndexOf('S');
                }

                var exits = Enumerable.Range(0, matrix[i].Count) .Where(x => matrix[i][x] == 'E') .ToList();
                foreach (var e in exits)
                {
                    endPoints.Add(new EndPoint(i, e));
                }
                //if (matrix[i].Any(x => x == 'E'))
                //{
                //    endRow = i;
                //    endColumn = matrix[i].IndexOf('E');
                //}
            }

            if (endPoints.Count == 0)
            {
                Console.WriteLine($"Robot stuck at {startRow} {startColumn}. Experiment failed.");
                return;
            }
            else
            {
                string directions = Console.ReadLine();
                int turns = 0;

                foreach (char letter in directions)
                {
                    if (regexLetter.IsMatch(letter.ToString()))
                    {
                        switch (letter)
                        {
                            case 'R':
                                while (true)
                                {
                                    startColumn = (startColumn + 1) % matrix[startRow].Count;
                                    if (regexMatrix.IsMatch(matrix[startRow][startColumn].ToString()))
                                    {
                                        break;
                                    }else if (string.IsNullOrWhiteSpace(matrix[startRow][startColumn].ToString()))
                                    {
                                        continue;
                                    }
                                    else
                                    {
                                        isPath = false;
                                        break;
                                    }
                                }
                                break;

                            case 'L':
                                while (true)
                                {
                                    startColumn = (startColumn + matrix[startRow].Count - 1) % matrix[startRow].Count;
                                    if (regexMatrix.IsMatch(matrix[startRow][startColumn].ToString()))
                                    {
                                        break;
                                    }
                                    else if (string.IsNullOrWhiteSpace(matrix[startRow][startColumn].ToString()))
                                    {
                                        continue;
                                    }
                                    else
                                    {
                                        isPath = false;
                                        break;
                                    }
                                }
                                break;

                            case 'D':
                                while (true)
                                {
                                    startRow = (startRow + 1) % matrixSize;
                                    if (startColumn > matrix[startRow].Count - 1)
                                    {
                                        continue;
                                    }
                                    else if (regexMatrix.IsMatch(matrix[startRow][startColumn].ToString()))
                                    {
                                        break;
                                    }
                                    else if (string.IsNullOrWhiteSpace(matrix[startRow][startColumn].ToString()))
                                    {
                                        continue;
                                    }
                                    else
                                    {
                                        isPath = false;
                                        break;
                                    }
                                }
                                break;

                            case 'U':
                                while (true)
                                {
                                    startRow = (startRow + matrixSize - 1) % matrixSize;

                                    if (startColumn > matrix[startRow].Count - 1)
                                    {
                                        continue;
                                    }
                                    else if (regexMatrix.IsMatch(matrix[startRow][startColumn].ToString()))
                                    {
                                        break;
                                    }
                                    else if (string.IsNullOrWhiteSpace(matrix[startRow][startColumn].ToString()))
                                    {
                                        continue;
                                    }
                                    else
                                    {
                                        isPath = false;
                                        break;
                                    }
                                }
                                break;
                        }


                        //Console.WriteLine();
                        //Console.WriteLine(letter);
                        //for (int i = 0; i < matrix.Count; i++)
                        //{
                        //    for (int j = 0; j < matrix[i].Count; j++)
                        //    {
                        //        if (i == startRow && j == startColumn)
                        //        {
                        //            Console.Write("#");
                        //        }
                        //        else
                        //        {
                        //            Console.Write(matrix[i][j]);
                        //        }
                        //    }
                        //    Console.WriteLine();
                        //}


                        turns++;

                        if (!isPath)
                        {
                            Console.WriteLine($"Robot stuck at {startRow} {startColumn}. Experiment failed.");
                            return;
                        }


                        foreach (var e in endPoints)
                        {
                            if (startRow == e.Row && startColumn == e.Column)
                            {
                                Console.WriteLine($"Experiment successful. {turns} turns required.");
                                return;
                            }
                        }

                        //if (startRow == endRow && startColumn == endColumn)
                        //{
                        //    Console.WriteLine($"Experiment successful. {turns} turns required.");
                        //    return;
                        //}
                    }
                }

                Console.WriteLine($"Robot stuck at {startRow} {startColumn}. Experiment failed.");
            }
        }
    }
}