using System;
using System.Linq;

class SequenceInMatrix
{
    static void Main(string[] args)
    {
        Console.WriteLine("Enter the matrix dimensions, separated by a space.");
        int[] dimensions = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();
        int n = dimensions[0];
        int m = dimensions[1];

        string[,] matrix = new string[n, m];

        Console.WriteLine("Enter the strings in each row, separated by a space.");
        for (int i = 0; i < n; i++)
        {
            string[] rowStrins = Console.ReadLine().Split(' ').ToArray();
            for (int j = 0; j < m; j++)
            {
                matrix[i, j] = rowStrins[j];
            }
        }

        int maxCount = 0;
        string maxString = "";
        for (int row = 0; row < n; row++)
        {
            for (int col = 0; col < m; col++)
            {
                int countX = 0;
                int countY = 0;

                while (row + countX < matrix.GetLength(0))
                {
                    if (matrix[row, col] == matrix[row + countX, col])
                    {
                        countX++;
                    }
                    else
                    {
                        break;
                    }
                }

                if (countX + 1 > maxCount)
                {
                    maxCount = countX;
                    maxString = matrix[row, col];
                }

                while (col + countY < matrix.GetLength(1))
                {
                    if (matrix[row, col] == matrix[row, col + countY])
                    {
                        countY++;
                    }
                    else
                    {
                        break;
                    }
                }

                if (countY + 1 > maxCount)
                {
                    maxCount = countY;
                    maxString = matrix[row, col];
                }
                countX = 0;

                while (row + countX < matrix.GetLength(0) && col + countX < matrix.GetLength(1))
                {
                    if (matrix[row, col] == matrix[row + countX, col + countX])
                    {
                        countX++;
                    }
                    else
                    {
                        break;
                    }
                }

                if (countX + 1 > maxCount)
                {
                    maxCount = countX;
                    maxString = matrix[row, col];
                }
            }
        }

        Console.Write("The the longest sequence is:  {0}", maxString);
        for (int i = 1; i < maxCount; i++)
        {
            Console.Write(",{0}", maxString);
        }
        Console.WriteLine();
    }
}