#include <iostream>
#include <string>

int main(void){
    int A, B, C, D, N;
    int F = 1023;
    std::string R;
    std::cin >> N;
    for(int i=0;i<10;i++){
        std::cin >> A >> B >> C >> D >> R;
        if(R=="YES"){
            F &= ((1 << A) | (1 << B) | (1 << C) | (1 << D));
        }
        else{
            F &= ~((1 << A) | (1 << B) | (1 << C) | (1 << D));
        }
    }
    for(int i=0;i<10;i++){
        if(((F >> i) & 1) == 1){
            std::cout << i << std::endl;
            return 0;
        } 
    }
    return 0;
}