#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<int> check(10, 1);
  REP (i, n) {
    set<int> st;
    REP (j, 4) {
      int tmp; cin >> tmp;
      st.insert(tmp);
    }
    string s;
    cin >> s;
    if (s == "YES") {
      REP (i, 10) {
        if (!st.count(i))
          check[i] = false;
      }
    } else {
      REP (i, 10) {
        if (st.count(i))
          check[i] = false;
      }
    }
  }
  
  cout << find(check.begin(), check.end(), 1) - check.begin() << endl;
  
  return 0;
}