#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, n) for(int i = 0; i < (n); i++)
#define rep1(i, n) for(int i = 1; i <= (n); i++)
#define co(x) cout << (x) << "\n"
#define cosp(x) cout << (x) << " "
#define ce(x) cerr << (x) << "\n"
#define cesp(x) cerr << (x) << " "
#define pb push_back
#define mp make_pair
#define Would
#define you
#define please


int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);


	int N;
	cin >> N;
	int A[6][4];
	string S[6];
	rep(i, N) {
		rep(ii, 4) cin >> A[i][ii];
		cin >> S[i];
	}
	rep1(i, 9) {
		int OK = 1;
		rep(ii, N) {
			if (S[ii] == "YES") {
				int aru = 0;
				rep(iii, 4) {
					if (A[ii][iii] == i) aru = 1;
				}
				if (aru == 0) OK = 0;
			}
			else {
				int aru = 0;
				rep(iii, 4) {
					if (A[ii][iii] == i) aru = 1;
				}
				if (aru == 1) OK = 0;
			}
		}
		if (OK) {
			co(i);
			break;
		}
	}

	Would you please return 0;
}