#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    int H,W; cin >> H >> W;
    vector<string> S(H);
    rep(i,H) cin >> S[i];

    auto check = [H, W](vector<string> S) {
        vector<pair<int,int>> P;
        rep(i,H)rep(j,W) if(S[i][j] == '*') P.push_back({i, j});
        sort(P.begin(), P.end());
        auto [x0, y0] = P[0];
        auto [x1, y1] = P[1];
        auto [x2, y2] = P[2];
        return (y1 - y0) * (x2 - x1) != (y2 - y1) * (x1 - x0);
    };

    for(auto [x, y] : vector<pair<int,int>>{{0, 0}, {0, W-1}, {H-1, 0}, {H-1, W-1}}) {
        if(S[x][y] != '*') {
            S[x][y] = '*';
            if(check(S)) {
                rep(i,H) cout << S[i] << "\n";
                return 0;
            }
            S[x][y] = '-';
        }
    }
}