#include <bits/stdc++.h>
#define REP(i, n) for(int i = 0; i < n; i++)
#define REPR(i, n) for(int i = n; i >= 0; i--)
#define FOR(i, m, n) for(int i = m; i < n; i++)
#define INF 2e9
#define ALL(v) v.begin(), v.end()
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<vector<int>> vvi;
typedef vector<string> vs;
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int n;
    vector<string> s(n);
    vector<string> t(n);
    cin >> n;
    REP(i, n)
    {
        cin >> s[i];
    }
    REP(i, n)
    {
        cin >> t[i];
    }

    int idx = 0;
    REP(i, n)
    {
        if(s[i] != t[i])
        {
            idx = i;
        }
    }

    cout << idx + 1 << endl;
    cout << s[idx] << endl;
    cout << t[idx] << endl;

}