#define _USE_MATH_DEFINES
#include  <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <string>
#include<math.h>
#include<iomanip>
#include<stdio.h>
#include <stdlib.h>
#include<stdio.h>
#include <queue>
#include<map>
#include <fstream>
#include <sstream>
#include<set>
#include<stack>
#include<time.h>
#include <sys/types.h>
#include <tuple>
#include <numeric>
#include <iterator>

typedef long long int ll;
//#include<bits/stdc++.h>


using namespace std;





int main()
{

    int Q;
    Q = 1;
    //cin >> Q;


    while (Q--) {
        int n;
        cin >> n;
        int f[11] = {};
        
        for (int i = 0; i < n; i++) {
            vector<int>t(4);
            for (int j = 0; j < 4; j++)cin >> t[j];
            string p;
            cin >> p;
            if (p == "NO") {
                for (int j = 0; j < 4; j++)f[t[j]] = -999;
            }
            else {
                for (int j = 0; j < 4; j++)f[t[j]]++;
            }
           
        }
        int ans = 0; int x = -999;
        for (int i = 0; i < 10; i++) {
            if (x > f[i])continue;
            ans = i; x = f[i];
        }
        cout << ans;
    }
    return 0;
}