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

int main(void) {
	int n;
	cin >> n;
	vector <pair<string, string>> str(n);
	for (int i = 0; i < n; i++) {
		cin >> str[i].first;
	}
	for (int i = 0; i < n; i++) {
		cin >> str[i].second;
		if (str[i].first != str[i].second)
			cout << i + 1 << endl << str[i].first << endl << str[i].second << endl;
	}
	return 0;
}