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

int main() {
  int N;
  cin >> N;
  vector<int> V(10, 1);

  while (N--) {
    vector<int> v(10);
    for (int j = 0, n; j < 4 && cin >> n; j++) v.at(n) = 1;
    string s;
    cin >> s;
    if (s == "YES") for (int j = 0; j < 10; j++) if (!v.at(j)) V.at(j) = 0;
    if (s == "NO") for (int j = 0; j < 10; j++) if (v.at(j)) V.at(j) = 0;
  }

  for (int i = 0; i < 10; i++) if (V.at(i)) cout << i;
}