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

int main(){
    int H, W;
    cin >> H >> W;
    vector<string> S(H);
    for (auto& s : S) cin >> s;

    dsu uf(H*W);
    auto id = [&](int i, int j){
        return i*W+j;
    };

    for (int i = 0; i < H; i++){
        for (int j = 0; j < W; j++){
            if (i > 0 && S[i][j] == S[i-1][j]) uf.merge(id(i, j), id(i-1, j));
            if (j > 0 && S[i][j] == S[i][j-1]) uf.merge(id(i, j), id(i, j-1));
            if (i+1 < H && S[i][j] == S[i+1][j]) uf.merge(id(i, j), id(i+1, j));
            if (j+1 < W && S[i][j] == S[i][j+1]) uf.merge(id(i, j), id(i, j+1));
        }
    }

    for (int i = 0; i < H; i++){
        for (int j = 0; j < W; j++){
            if (uf.size(id(i, j)) >= 4) S[i][j] = '.';
        }
    }

    for (auto s : S) cout << s << endl;
}