#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)
#define FOR(i,b,e) for (int i=(int)(b); i<(int)(e); i++)
#define ALL(x) (x).begin(), (x).end()

const double PI = acos(-1);

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  int n;
  cin >> n;
  vector<string> a(n), b(n);
  REP (i, n) cin >> a[i];
  REP (i, n) cin >> b[i];

  REP (i, n) {
    if (a[i] != b[i]) {
      cout << (i+1) << endl;
      cout << a[i] << endl;
      cout << b[i] << endl;
    }
  }
  
  return 0;
}