#include <bits/stdc++.h>
using namespace std;

//--------------------------------------------
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define RFOR(i,a,b) for(int i=(b)-1;i>=(a);i--)
#define REP(i,n) FOR(i,0,n)
#define RREP(i,n) RFOR(i,0,n)
#define LL long long
#define INF INT_MAX/3

//--------------------------------------------
const double EPS = 1e-14;
const double PI  = acos(-1.0);

//--------------------------------------------

int main(){
  int n;

  scanf("%d",&n);

  string sa,sb;
  vector <string> a,b;

  REP (i, n) {
    cin >> sa;
    a.push_back(sa);
  }

  REP (i, n) {
    cin >> sb;
    b.push_back(sb);
  }

  REP (i, n) {
    if (a.at(i) != b.at(i)) {
      cout << i + 1 << "\n" << a.at(i) << "\n" << b.at(i) << "\n";
    }
  }
}