#include <iostream>
#include <string>

using namespace std;

int main (void){
	int    N = 0;
	int    n[6][4]      = { { 0 } };
	string R[6];
	unsigned int ans[6] = { 0 };
	unsigned int answer = 0b1111111111;

	// input
	cin >> N;

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

	// solve

	for(int i = 0; i < N; i++){
		for(int j = 0; j < 4; j++){
			ans[i] = ans[i] | (1 << n[i][j]);
		}
		if(R[i] == "NO"){
			ans[i] = ~ans[i];
		}
	}

	for(int i = 0; i < N; i++){
		answer = answer & ans[i];
	}

	//output
	for(int i = 0; i < 10; i++){
		if(answer & (1 << i)){
			cout << i << endl;
			break;
		}
	}

	return 0;
}