#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <string>
#include <sstream>
#include <complex>
#include <algorithm>
#include <functional>
#include <vector>
#include <stack>
#include <queue>
#include <set>
#include <map>
#include <cmath>
#include <cassert>
#include <fstream>
#define REP(i,n) for(int i=0;i<n;i++)
#define FOR(a,b) for(:a<b;a++)
#define SSTR( x ) static_cast< std::ostringstream & >( \
        ( std::ostringstream() << std::dec << x ) ).str()
#define ALL(s) (s).begin(), (s).end()
using namespace std;
typedef long long unsigned int llu;
typedef long long ll;

int main (){
  int N;
  while(cin >> N){
    string* s = new string[N];
    string* t = new string[N];
      
    REP(i,N){
      cin >> s[i];
    }
    REP(i,N){
      cin >> t[i];
    }
    REP(i,N){
      if(s[i] != t[i]){
	cout << i + 1 << endl << s[i] << endl << t[i] << endl;
	break;
      }
    }
  }
  return 0;
}