using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace PlusRemove
{
    class PlusRemove
    {
        static void Main(string[] args)
        {
            string input = Console.ReadLine();
            List<string> text = new List<string>();
            int max = 0;
            while (input != "END")
            {
                text.Add(input);
                if (input.Length > max)
                {
                    max = input.Length;
                }
                input = Console.ReadLine();
            }
            char[,] first = new char[text.Count, max];
            char[,] second = new char[text.Count, max];
            for (int row = 0; row < text.Count; row++)
            {
                string current = text[row];
                for (int col = 0; col < max; col++)
                {
                    if (col < current.Length)
                    {
                        first[row, col] = Char.ToLower(current[col]);
                        second[row, col] = current[col];
                    }
                    else
                    {
                        first[row, col] = ' ';
                        second[row, col] = ' ';
                    }
                }
            }
            for (int row = 0; row < first.GetLength(0) - 2; row++)
            {
                for (int col = 1; col < first.GetLength(1) - 1; col++)
                {
                    if (first[row,col] == first[row+1,col]
                        && first[row,col] == first[row+2,col]
                        && first[row,col] == first[row+1,col-1]
                        && first[row,col] == first[row+1,col+1])
                    {
                        second[row, col] = ' ';
                        second[row + 1, col] = ' ';
                        second[row + 2, col] = ' ';
                        second[row + 1, col - 1] = ' ';
                        second[row + 1, col + 1] = ' ';
                    }
                }
            }
            PrintMatrix(second);
        }

        private static void PrintMatrix(char[,] matrix)
        {
            for (int row = 0; row < matrix.GetLength(0); row++)
            {
                for (int col = 0; col < matrix.GetLength(1); col++)
                {
                    if (matrix[row,col] != ' ')
                    {
                        Console.Write(matrix[row,col]);
                    }
                }
                Console.WriteLine();
            }
        }
    }
}