#include <iostream>
#include <string>

using namespace std;

int main(void) {
	int N = 0;
	int n[7][4] = {{0}};
	string R[7];
	bool no[10] = {false}, yes[10] = {false}, d[10] = {false};
	bool f = false;

	cin >> N;

	for(int i = 0; i < N; i++){
		for(int j = 0; j < 4; j++){
			cin >> n[i][j];
		}
		cin >> R[i];
	}

	for(int i = 0; i < N; i++){
		for(int j = 0; j < 4; j++){
			if(R[i] == "NO"){
				no[n[i][j]] = true;
			}
			else{
				if(yes[n[i][j]]){
					d[n[i][j]] = true;
				}
				yes[n[i][j]] = true;
				f = true;
			}
		}
	}

	for(int i = 0; i < 10; i++){
		if(!f&&!no[i]){
			cout << i << endl;
		}
		if(f && ((yes[i] && !no[i]) && d[i])){
			cout << i << endl;
		}
	}

	return 0;
}