#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <stack>
#include <algorithm>
#include <string>
#include <map>
#include <iterator>
#include <set>
#include <queue>

using namespace std;


int main() {

    int N;
    cin >> N;
    vector<string> ss;
    vector<string> ts;

    for (int i = 0; i < N; ++i) {
        string S;
        cin >> S;
        ss.push_back(S);
    }
    for (int i = 0; i < N; ++i) {
        string T;
        cin >> T;
        ts.push_back(T);
    }
    for (int i = 0; i < N; ++i) {
        if (ss[i] != ts[i]) {
            cout << i + 1 << endl;
            cout << ss[i] << endl;
            cout << ts[i] << endl;
        }
    }

    return 0;
}