#include <iostream>
#include <vector>
#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];
	}

	int idx = 0;
	for (int i = 0; i < n; i++) {
		if (s[i] != t[i]) {
			idx = i;
			break;
		}
	}

	cout << idx + 1 << endl << s[idx] << endl << t[idx] << endl;
	return 0;
}