#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
using namespace std;

int main()
{
	int N; cin >> N;
	vector<string>s(N), t(N);
	for (int i = 0; i < N; i++) {
		cin >> s[i];
	}
	for (int i = 0; i < N; i++) {
		cin >> t[i];
	}

	for (int i = 0; i < N; i++) {
		if (s[i] != t[i]) {
			cout << i + 1 << endl;
			cout << s[i] << endl;
			cout << t[i] << endl;
		}
	}

    return 0;
}