#include <bits/stdc++.h>

using namespace std;
using ll = long long;

int main(){
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);

    int H, W, x, y;
    cin >> H >> W;
    vector<string> S(H), T;
    for (int i=0; i<H; i++) cin >> S[i];
    T = S;
    vector<pair<int, int>> v;
    int dx[4] = {1,0,-1,0}, dy[4] = {0,1,0,-1};
    auto check=[&](int x, int y){
        return 0<=x && x<H && 0<=y && y<W;
    };
    vector used(H, vector<bool>(W));

    auto dfs=[&](auto self, int x, int y)->void{
        int nx, ny;
        used[x][y] = 1;
        v.push_back({x, y});
        for (int k=0; k<4; k++){
            nx = x+dx[k]; ny = y+dy[k];
            if (!check(nx, ny) || used[nx][ny]) continue;
            if (S[x][y] != S[nx][ny]) continue;
            self(self, nx, ny);
        }
    };

    for (int i=0; i<H; i++){
        for (int j=0; j<W; j++){
            if (used[i][j]) continue;
            dfs(dfs, i, j);
            if (v.size()>=4){
                for (auto [x, y] : v){
                    T[x][y] = '.';
                }
            }
            v.clear();
        }
    }

    for (int i=0; i<H; i++) cout << T[i] << endl;

    return 0;
}