#include <bits/stdc++.h>
using namespace std;
int main(){
  int N;
  cin >> N;
  vector<int> A(N), B(N), C(N), D(N);
  vector<string> R(N);
  for (int i = 0; i < N; i++){
    cin >> A[i] >> B[i] >> C[i] >> D[i] >> R[i];
  }
  int ans;
  for (int i = 0; i < 10; i++){
    bool ok = true;
    for (int j = 0; j < N; j++){
      string T;
      if (i == A[j] || i == B[j] || i == C[j] || i == D[j]){
        T = "YES";
      } else {
        T = "NO";
      }
      if (T != R[j]){
        ok = false;
      }
    }
    if (ok){
      ans = i;
    }
  }
  cout << ans << endl;
}