#include <bits/stdc++.h>
using namespace std;

int main() {
	int n;
	cin >> n;

	vector<string> v1(n);
	for (int i = 0; i < n; i++) {
		cin >> v1.at(i);
	}
	vector<string> v2(n);
	for (int i = 0; i < n; i++) {
		cin >> v2.at(i);
	}

	for (int i = 0; i < n; i++) {
		string a = v1.at(i),
			   b = v2.at(i);

		if (a != b) {
			cout << i + 1 << endl;
			cout << a << endl;
			cout << b << endl;
		}
	}
}