#include <bits/stdc++.h>

using namespace std;

#pragma GCC target("avx2")
#pragma GCC optimize("O3")

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    int n;
    cin >> n;

    for (int i = 1; i <= n; ++i) {
        for (int j = 1; j <= n; ++j) {
            char c;
            cin >> c;

            if (c == '?') {
                if ((i^j)&1) cout << 'S';
                else cout << 'F';
            } else cout << c;
        }

        cout << '\n';
    }

    return 0;
}