from collections import deque
H,W=map(int,input().split())
G=[list(input()) for _ in range(H)]
ans=[["" for _ in range(W)] for _ in range(H)]
for i in range(H):
    for j in range(W):
        if ans[i][j]==".":continue
        now=G[i][j]
        vis=[[0 for _ in range(W)] for _ in range(H)]
        Q=deque([(i,j)])
        while Q:
            ci,cj=Q.popleft()
            vis[ci][cj]=1
            for di,dj in [(-1,0),(1,0),(0,-1),(0,1)]:
                if 0<=ci+di<H and 0<=cj+dj<W and vis[ci+di][cj+dj]==0 and \
                    G[ci+di][cj+dj]==now:
                    Q.append((ci+di,cj+dj))
        cnt=0
        for ii in range(H):
            cnt+=sum(vis[ii])
        if cnt>=4:
            for ii in range(H):
                for jj in range(W):
                    if vis[ii][jj]==1:ans[ii][jj]="."
        else:
            ans[i][j]=G[i][j]
for i in range(H):
    print("".join(ans[i]))