#include <iostream>
#include <vector>
#include <algorithm>
#define REP(i, a, n) for(ll i = ((ll) a); i < ((ll) n); i++)
#define INF 1000000000LL
#define MOD 1000000007LL
using namespace std;
typedef long long ll;

ll N;
string S[10], T[10];

int main(void) {
  cin >> N;
  REP(i, 0, N) cin >> S[i];
  REP(i, 0, N) cin >> T[i];
  ll ans;
  REP(i, 0, N) if(S[i] != T[i]) ans = i + 1;
  cout << ans << endl;
  cout << S[ans - 1] << endl;
  cout << T[ans - 1] << endl;
}