package main

import . "fmt"

func main() {
	var h,w int
	Scan(&h,&w)
	f:=make([][]byte,h)
	m:=make([][]int,h)
	for i:=range f {
		var s string
		Scan(&s)
		f[i]=[]byte(s)
		m[i]=make([]int,w)
	}
	v:=0
	t:=make([]int,h*w+1)
	for r,rr:=range f {
		for c,cc := range rr {
			if m[r][c]!=0 {
				continue
			}
			v++
			st:=[]int{r*w+c}
			for len(st)>0 {
				e:=st[len(st)-1]
				st=st[:len(st)-1]
				x,y:=e%w,e/w
				if f[y][x]!=cc {
					continue
				}
				if m[y][x]!=0 {
					continue
				}
				m[y][x]=v
				t[v]++
				if y>0 {
					st=append(st,e-w)
				}
				if y+1<h {
					st=append(st,e+w)
				}
				if x>0 {
					st=append(st,e-1)
				}
				if x+1<w {
					st=append(st,e+1)
				}
			}
		}
	}
	for r,rr:=range f {
		for c:=range rr {
			if t[m[r][c]]>=4 {
				f[r][c]='.'
			}
		}
		Println(string(rr))
	}
	
}