from collections import deque
from copy import deepcopy
H,W=map(int,input().split())
G=[list(input()) for _ in range(H)]
ans=deepcopy(G)
dij=[(1,0),(-1,0),(0,1),(0,-1)]
vis=[[False for _ in range(W)] for _ in range(H)]

for i in range(H):
    for j in range(W):
        if vis[i][j]:
            continue
        if G[i][j]==".":
            continue
        vis[i][j]=True
        Q=deque()
        Q.append((i,j))
        cands=[(i,j)]
        while len(Q):
            pi,pj=Q.popleft()
            for di,dj in dij:
                ni=pi+di
                nj=pj+dj
                if ni<0 or H<=ni:
                    continue
                if nj<0 or W<=nj:
                    continue
                if vis[ni][nj]:
                    continue
                if G[ni][nj]==".":
                    continue
                if G[pi][pj]==G[ni][nj]:
                    vis[ni][nj]=True
                    Q.append((ni,nj))
                    cands.append((ni,nj))
        if len(cands)>=4:
            for ni,nj in cands:
                ans[ni][nj]="."

for row in ans:
    for x in row:
        print(x,end="")
    print()