from collections import defaultdict,deque
H,W=list(map(int,input().split()))
MAP=[]
for i in range(H):
	s=input()
	MAP.append(s)
ANS=[]
for i in range(H):
	ANS.append(["."]*W)
for i in range(H):
	for j in range(W):
		ANS[i][j]=MAP[i][j]
check=set()
for i in range(H):
	for j in range(W):
		if (i,j) in check:
			continue
		Q=deque()
		c=set()
		Q.append((i,j))
		c.add((i,j))
		while len(Q)>0:
			x,y=Q.popleft()
			if x>0:
				if (x-1,y) not in c and MAP[x-1][y]==MAP[x][y]:
					c.add((x-1,y))
					Q.append((x-1,y))
			if x<H-1:
				if (x+1,y) not in c and MAP[x+1][y]==MAP[x][y]:
					c.add((x+1,y))
					Q.append((x+1,y))
			if y>0:
				if (x,y-1) not in c and MAP[x][y-1]==MAP[x][y]:
					c.add((x,y-1))
					Q.append((x,y-1))
			if y<W-1:
				if (x,y+1) not in c and MAP[x][y+1]==MAP[x][y]:
					c.add((x,y+1))
					Q.append((x,y+1))
		#print(i,j,c)
		if len(c)>=4:
			for x,y in c:
				ANS[x][y]="."
		for k in c:
			check.add(k)
for i in range(H):
	print("".join(ANS[i]))