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

template<class T> istream& operator >> (istream& is, vector<T>& vec) {
    for(T& x : vec) is >> x;
    return is;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int h, w;
    cin >> h >> w;
    vector<string> A(h);
    cin >> A;
    vector B(h, vector<bool>(w));
    vector<pair<int,int>> vec;
    for(int y = 0; y < h; y++){
        for(int x = 0; x < w; x++){
            if(B[y][x]) continue;
            vec.clear();
            B[y][x] = true;
            vec.emplace_back(y, x);
            for(int i = 0; i < vec.size(); i++){
                auto [cy, cx] = vec[i];
                for(int i = 0; i < 4; i++){
                    int ny = cy + (i == 0) - (i == 1);
                    int nx = cx + (i == 2) - (i == 3);
                    if(ny < 0 || nx < 0 || ny >= h || nx >= w) continue;
                    if(A[y][x] != A[ny][nx] || B[ny][nx]) continue;
                    B[ny][nx] = true;
                    vec.emplace_back(ny, nx);
                }
            }
            if(vec.size() >= 4) for(auto [y, x] : vec) A[y][x] = '.';
        }
        cout << A[y] << '\n';
    }
}