#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<int(n); i++)
#define FOR(i,m,n) for(int i=int(m); i<int(n); i++)
#define ALL(obj) (obj).begin(),(obj).end()
#define VI vector<int>
#define VLL vector<long long>
#define VVI vector<vector<int>>
#define VVLL vector<vector<long long>>
#define VC vector<char>
#define VS vector<string>
#define VVC vector<vector<char>>
#define fore(i,a) for(auto &i:a)
typedef long long ll;
typedef pair <int, int> P;
template<class T> bool chmax(T &a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> bool chmin(T &a, T b) { if (a > b) { a = b; return true; } return false; }
const int  INF = 2147483647;
const ll INFL = 9223372036854775807;
const ll mod = 1000000007;



int main() {
	int n;
	cin >> n;
	VI e(10), f(10);
	REP(i, n) {
		int a, b, c, d;
		string r;
		cin >> a >> b >> c >> d >> r;
		if (r == "NO") {
			f[a] = f[b] = f[c] = f[d] = 1;
		}
		else {
			e[a]++;
			e[b]++;
			e[c]++;
			e[d]++;
		}
	}
	int res = -1;
	int ans = -1;
	REP(i, 10) {
		if (f[i] == 0) {
			if (e[i] > res) {
				res = e[i];
				ans = i;
			}
		}
	}
	cout << ans << endl;
	return 0;
}