// #define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
int main() {
    // Input
    int N;
    cin >> N;
    vector<string> S(N), T(N);
    rep(i, N) cin >> S[i];
    rep(i, N) cin >> T[i];

    // Output
    rep(i, N) if (S[i] != T[i]) {
        cout << i + 1 << endl;
        cout << S[i] << endl;
        cout << T[i] << endl;
    }
}