#include <iostream>
#include <vector>
using namespace std;

int main(void) {
	cin.tie(0);
	ios::sync_with_stdio(false);
	
	int n, a, b, c, d;
	string r;
	vector<int> ans(10, 1);
	cin >> n;
	for (int i = 0; i < n; ++i) {
		cin >> a >> b >> c >> d >> r;
		if (r == "YES") {
			for (int j = 0; j <= 9; ++j) {
				if (j != a && j != b && j != c && j != d)
					ans[j] = 0;
			}
		}
		if (r == "NO") {
			ans[a] = 0; ans[b] = 0; ans[c] = 0; ans[d] = 0;
		}
	}
	for (int i = 0; i < 10; ++i) if (ans[i]) cout << i;
	return 0;
}