#include<iostream>
#include<string>
using namespace std;

int yeslist[9];
int nolist[9];
int cnt;

int main(){
  int N;
  cin>>N;
  for(int i=0;i<N;i++){
    int a,b,c,d;
    string str;
    cin>>a>>b>>c>>d>>str;
    if(str == "YES"){
      cnt++;
      yeslist[a-1]++;
      yeslist[b-1]++;
      yeslist[c-1]++;
      yeslist[d-1]++;
    }else{
      nolist[a-1] |= 1;
      nolist[b-1] |= 1;
      nolist[c-1] |= 1;
      nolist[d-1] |= 1;
    }
  }
  for(int i=0;i<9;i++){
    if(yeslist[i] == cnt && !nolist[i]){
      cout<<i+1<<endl;
    }
  }
  return 0;
}