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

int main(){
	int n;
	cin >> n;
	bool num[10];
	int count[10];
	fill_n(num, 10, true);
	fill_n(count, 10, 0);
	int a, b, c, d;
	string str;
	for(int i = 0; i < n; i++){
		cin >> a >> b >> c >> d >> str;
		if(str == "NO"){
			num[a] = false;
			num[b] = false;
			num[c] = false;
			num[d] = false;
		}else{
			count[a]++;
			count[b]++;
			count[c]++;
			count[d]++;
		}
	}
	int max_count = -1;
	int max_num;
	for(int i = 0; i < 10; i++){
		if(num[i] == true){
			if(max_count < count[i]){
				max_count = count[i];
				max_num = i;
			}
		}
	}
	cout << max_num << endl;
}