#include <iostream>
#include <vector>
#include <string>
using namespace std;
int main() {
	int n;
	cin >> n;

	vector<string> v1;
	vector<string> v2;
	string tmp;

	for (auto i = 0; i < n; i++) {
		cin >> tmp;
		v1.push_back(tmp);
	}
	for (auto i = 0; i < n; i++) {
		cin >> tmp;
		v2.push_back(tmp);
	}

	int i;
	for (i = 0; i < n; i++) {
		if (v1.at(i) != v2.at(i)) {
			break;
		}
	}
	cout << i + 1 << endl;
	cout << v1.at(i) << endl;
	cout << v2.at(i) << endl;
}