h,w=map(int,input().split())
g=[list(input()) for i in range(h)]
v=[[0]*w for i in range(h)]
for i in range(h):
	for j in range(w):
		if g[i][j]!="." and v[i][j]==0:
			c=g[i][j]
			u=[]
			q=[(i,j)]
			v[i][j]=1
			for sx,sy in q:
				u+=[(sx,sy)]
				dx,dy=1,0
				for _ in range(4):
					tx,ty=sx+dx,sy+dy
					dx,dy=-dy,dx
					if 0<=tx<h and 0<=ty<w:
						if g[tx][ty]==c and v[tx][ty]==0:
							q+=[(tx,ty)]
							v[tx][ty]=1
			if len(u)>=4:
				for x,y in u:
					g[x][y]="."
for i in range(h):
	print("".join(g[i]))