#include <iostream>

int n, m;
char a[1007][1007], b[1007][1007];
int main() {
    std::cin.tie(nullptr)->sync_with_stdio(false);
    std::cin >> n >> m;
    for (int i = 1; i <= n; ++i) {
        std::cin >> (a[i] + 1);
    }
    int cc = 0;
    for (int i = 1; i <= n; ++i) {
        std::cin >> (b[i] + 1);
        for (int j = 1; j <= m; ++j) {
            cc += (a[i] != b[i]);
        }
    }
    if (cc > n * m / 2) {
        for (int i = 1; i <= n; ++i) {
            for (int j = 1; j <= m; ++j) {
                a[i][j] ^= ('X' ^ '.');
            }
        }
    }
    for (int i = 1; i <= n; ++i) {
        std::cout << (a[i] + 1) << '\n';
    }
    
    return 0;
}