#include <iostream>
#include <string>

int main(void)
{
    using namespace std;
    int N,i;
    cin >> N;
    string a[N],b[N];
    for (i = 0; i < N; i++) {
        cin >> a[i];
    }
    for (i = 0; i < N; i++) {
        cin >> b[i];
    }
    for (i = 0; i < N; i++) {
        if (a[i] != b[i]) {
            break;
        }
    }
    cout << i + 1 << "\n";
    cout << a[i] << "\n";
    cout << b[i] << "\n";
    return 0;
}