#include <bits/stdc++.h>
#ifdef _DEBUG
#include "debug.hpp"
#else
#define debug(...)
#endif
#define fastIO (cin.tie(0), cout.tie(0), ios::sync_with_stdio(false))
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define MAX 10
using namespace std;

void solve() {
  int n;
  cin >> n;
  vector<string> S(n), T(n);
  for (auto &s : S) cin >> s;
  for (auto &t : T) cin >> t;

  for (int i = 0; i < n; i++) {
    if (S[i] != T[i]) {
      cout << (i + 1) << '\n';
      cout << S[i] << '\n';
      cout << T[i] << '\n';
      return;
    }
  }
}

void wrapper() {
  int loop;
  cin >> loop;
  rep(i, loop) {
    cout << "[TEST " << i + 1 << "]\n";
    solve();
    cout << "\n";
  }
}

int main() {
  fastIO;
#ifdef _DEBUG
  wrapper();
#else
  solve();
#endif
}