#include <iostream>
#include <vector>
#include <algorithm>
#include <queue>
#include <utility>

using namespace std;

int main(void){

    vector<bool> ans(10, true);
    int n, num[5];
    string r;
    cin >> n;
    for(int i = 0; i < n; i++){
        cin >> num[0] >> num[1] >> num[2] >> num[3] >> r;
        if(r == "NO"){
            for(int j = 0; j < 4; j++) ans[num[j]] = false;
        }else{
            for(int j = 0; j < 10; j++){
                if(num[0] == j || num[1] == j || num[2] == j || num[3] == j) continue;
                ans[j] = false;
            }
        }
    }

    for(int i = 0; i < 10; i++){
        if(ans[i]) cout << i << endl;
    }

    return 0;
}