from collections import deque

def bfs(si, sj, moji):#sensorsからパクった
    que = deque()
    que.append((si, sj))
    positions = []  
    while que:
        oi, oj = que.popleft()
        positions.append((oi, oj)) 
        for ni, nj in neighbor8(oi, oj):
            if not seen[ni][nj] and S[ni][nj] == moji:
                seen[ni][nj] = True
                que.append((ni, nj))
    return positions  

def neighbor8(i, j):#sensorsからパクった2
    lst = []
    moved=[(-1,0),(1,0),(0,-1),(0,1)]
    for mi, mj in moved:
        ni, nj = i+mi, j+mj
        if 0 <= ni < H and 0 <= nj < W:
            lst.append((ni, nj))
    return lst

H, W = map(int, input().split())
S = [list(input()) for _ in range(H)] 

seen = [[False] * W for _ in range(H)]
for i in range(H):
    for j in range(W):
        if not seen[i][j]:
            positions = bfs(i, j, S[i][j])
            if len(positions) > 4: 
                for pi, pj in positions:
                    S[pi][pj] = '.'  

for row in S:
    print(''.join(row))