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

int candidate_number[10];

int main(){
    int N;
    cin >> N;

    for(int i=0;i<10;++i){
        candidate_number[i] = 1;
    }

    int a, b, c, d;
    string r;
    for(int i=0;i<N;++i){
        cin >> a >> b >> c >> d >> r;
        if(r == "YES"){
            for(int i=1;i<10;++i){
                if(i != a && i != b && i != c && i != d){
                    candidate_number[i] = -1;
                }
            }
        } else if(r == "NO"){
            candidate_number[a] = candidate_number[b] = candidate_number[c] = candidate_number[d] = -1;
        }
    }
    for(int i=1;i<10;++i){
        if(candidate_number[i]==1){
            cout << i << endl;
            break;
        }
    }

    return 0;
}