#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=1;i<=(n);i++)
#define ll long long
using mint = modint998244353;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

int main()
{
    int h, w;
    cin >> h >> w;
    vector<string> g(h);
    rep(i,h) cin >> g[i];
    dsu uf(h*w);
    vector<int> di = {1, 0, -1, 0};
    vector<int> dj = {0, -1, 0, 1};
    rep(i,h)rep(j,w) {
        rep(d,4) {
            int ni = i + di[d];
            int nj = j + dj[d];
            if(ni<0 || ni>=h || nj<0 || nj>=w) continue;
            if(g[i][j]==g[ni][nj]) uf.merge(ni*w+nj, i*w+j);
        }
    }
    rep(i,h){
        rep(j,w) {
            if(uf.size(i*w+j)>=4)cout<<".";
            else cout<<g[i][j];
        }
        cout << endl;
    }
    return 0;
}