#include <iostream>
using namespace std;

int main(){
   int n;
   bool num[10] = {true};
   cin >> n;
   for(int a,b,c,d,i = 0;i < n;i++){
      string r;
      cin >> a >> b >> c >> d >> r;
      if(r == "NO") num[a] = num[b] = num[c] = num[d] = false;
   }
   for(int i = 0;i < 10;i++) if(num[i]) cout << i << endl;
}