/**
	author:  shobonvip
	created: 2024.10.25 21:21:36
**/

#include<bits/stdc++.h>
using namespace std;

//* ATCODER
#include<atcoder/all>
using namespace atcoder;
typedef modint998244353 mint;
//*/

/* BOOST MULTIPRECISION
#include<boost/multiprecision/cpp_int.hpp>
using namespace boost::multiprecision;
//*/

typedef long long ll;

#define rep(i, s, n) for (int i = (int)(s); i < (int)(n); i++)
#define rrep(i, s, n) for (int i = (int)(n)-1; i >= (int)(s); i--)

template <typename T> bool chmin(T &a, const T &b) {
	if (a <= b) return false;
	a = b;
	return true;
}

template <typename T> bool chmax(T &a, const T &b) {
	if (a >= b) return false;
	a = b;
	return true;
}

template <typename T> T max(vector<T> &a){
	assert(!a.empty());
	T ret = a[0];
	for (int i=0; i<(int)a.size(); i++) chmax(ret, a[i]);
	return ret;
}

template <typename T> T min(vector<T> &a){
	assert(!a.empty());
	T ret = a[0];
	for (int i=0; i<(int)a.size(); i++) chmin(ret, a[i]);
	return ret;
}

template <typename T> T sum(vector<T> &a){
	T ret = 0;
	for (int i=0; i<(int)a.size(); i++) ret += a[i];
	return ret;
}

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	
	int h, w; cin >> h >> w;
	dsu uf(h * w);
	vector g(h, vector<char>(w));
	rep(i,0,h)rep(j,0,w)cin>>g[i][j];

	rep(i,0,h){
		rep(j,0,w){
			for(auto[x,y]:{
				pair(i-1,j),
				pair(i+1,j),
				pair(i,j-1),
				pair(i,j+1)
			}){
				if(!(0<=x&&x<h))continue;
				if(!(0<=y&&y<w))continue;
				if('A'<=g[i][j]&&g[i][j]<='Z'){
					if(g[i][j]==g[x][y])uf.merge(i*w+j,x*w+y);
				}
			}
		}
	}

	rep(i,0,h)rep(j,0,w)if(uf.size(i*w+j)>=4)g[i][j]='.';
	rep(i,0,h){
		rep(j,0,w){
			cout<<g[i][j];
		}
		cout<<'\n';
	}
}