#include <iostream>
#include <vector>
#include <algorithm>
#include <functional>
#include <string>
using namespace std;

int main() {
  vector<int> v(10, 1);
  vector<int> a(4);
  int N;
  string s;
  cin >> N;
  while (N--) {
    for (auto &x : a) {
      cin >> x;
    }
    cin >> s;
    if (s == "YES") {
      for (auto &x : a) {
        if (v[x] != 0) {
          v[x]++;
        }
      }
    } else {
      for (auto &x : a) {
        v[x] = 0;
      }
    }
  }
  int max = 0;
  int ans = -1;
  for (int i = 0; i < 10; i++) {
    if (v[i] > max) {
      max = v[i];
      ans = i;
    }
  }
  cout << ans << endl;
}