#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <climits>
#include <numeric>
#include <iterator>
#include <cmath>
#include <set>
#include <bitset>
#include <cassert>
using namespace std;

int main() {
	bitset<10> res {};
	res.set();
	
	int N {};
	cin >> N;

	for (int i = 0; i < N; ++i) {
		bitset<10> tmp {};
		for (int j = 0; j < 4; ++j) {
			int d {};
			cin >> d;
			tmp.set(d);
		}
		string flag {};
		cin >> flag;
		if (flag == "YES") {
			res &= tmp;
		} else {
			res &= ~tmp;
		}
	}
	assert(res.count() == 1);
	for (int k = 0; k < 10; ++k) {
		if (res[k] == 1) {
			cout << k << endl;
			return 0;
		}
	}
	return 1;
}