#include <bits/stdc++.h>

using namespace std;


int main(void)
{
    cin.tie(0);
    ios::sync_with_stdio(false);
   
    int n;
    vector <string> a, b;
    string s;

    cin >> n;

    for (int i = 0; i < n; i++)
    {
        cin >> s;
        a.push_back(s);
    }

    for (int i = 0; i < n; i++)
    {
        cin >> s;
        b.push_back(s);
    }

    if (n == 1)
    {
        cout << 1 << '\n';
        cout << a[0] << '\n';
        cout << b[0] << '\n';
    }
    else
    {
        for (int i = 0; i < n; i++)
        {
            if (a[i] != b[i])
            {
                cout << i + 1 << '\n';
                cout << a[i] << '\n';
                cout << b[i] << '\n';
                break;
            }
        }
    }


    return 0;
}