using System.Collections.Generic;
using System;

public class Hello
{
    public static int[] dx, dy;
    static void Main()
    {
        dx = new int[] { 0, 1, 0, -1 };
        dy = new int[] { 1, 0, -1, 0 };
        string[] line = Console.ReadLine().Trim().Split(' ');
        var h = int.Parse(line[0]);
        var w = int.Parse(line[1]);
        var map = new char[h, w];
        for (int i = 0; i < h; i++)
        {
            var s = Console.ReadLine().Trim();
            for (int j = 0; j < w; j++) map[i, j] = s[j];
        }
        getAns(h, w, map);
    }
    static void bfs(int h, int w, char[,] map, int sx, int sy)
    {
        var c = map[sx, sy];
        var aa = new List<(int x, int y)>();
        var visited = new bool[h, w];
        var q = new Queue<(int x, int y)>();
        q.Enqueue((sx, sy));
        visited[sx, sy] = true;
        aa.Add((sx, sy));
        while (q.Count > 0)
        {
            var t = q.Dequeue();
            if (visited[t.x, t.y]) continue;
            for (int i = 0; i < 4; i++)
            {
                var nx = t.x + dx[i];
                var ny = t.y + dy[i];
                if (nx >= 0 && nx < h && ny >= 0 && ny < w && map[nx, ny] == c && !visited[nx, ny])
                {
                    aa.Add((nx, ny));
                    q.Enqueue((nx, ny));
                    visited[nx, ny] = true;
                }
            }
        }
        if (aa.Count >= 4) foreach (var z in aa) map[z.x, z.y] = '.';
    }
    static void print(int h, int w, char[,] map)
    {
        var p = new char[w];
        for (int i = 0; i < h; i++)
        {
            for (int j = 0; j < w; j++) p[j] = map[i, j];
            Console.WriteLine(new string(p));
        }
    }
    static void getAns(int h, int w, char[,] map)
    {
        for (int i = 0; i < h; i++)
        {
            for (int j = 0; j < w; j++)
            {
                if (map[j, i] != '.') bfs(h, w, map, i, j);
            }
        }
        print(h, w, map);
    }
}