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

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
#define FOR(i, a, b) for (int i=a; i<(b); i++)
#define range(a) a.begin(), a.end()
#define endl "\n"
#define Yes() cout << "Yes" << endl
#define No() cout << "No" << endl
#define MP make_pair
const unsigned long long mod = 1e9 + 7;
const long long INF = 1LL<<60;
const int dx[4]={1,0,-1,0};
const int dy[4]={0,1,0,-1};
void chmin(long long &a, long long b) { if (a > b) a = b; }
void chmax(long long &a, long long b) { if (a < b) a = b; }

int main(void){
	ios::sync_with_stdio(0);
	cin.tie(0);
	bool A[10];
	FOR(i,0,10)	A[i]=true;
	int N;
	cin >> N;
	while(N--){
		int B[4];
		string ans;
		FOR(i,0,4){
			cin >> B[i];
		}
		cin >> ans;
		if(ans=="YES"){
			FOR(i,0,10){
				bool r = false;
				FOR(j,0,4){
					if(i==B[j]){
						r = true;
					}
				}
				if(!r){
					A[i] = false;
				}
			}
		}else{
			FOR(i,0,4){
				A[B[i]] = false;
			}
		}
	}

	FOR(i,0,10){
		if(A[i]==true){
			cout << i << endl;
			return 0;
		}
	}

	return 0;
}