import java.util.*;

public class no24{
    public static void main(String... args){
        
        Scanner scan = new Scanner(System.in);
        
        int n = scan.nextInt();
        int res[] = new int[10];
        int a,b,c,d,check=0;
        String flag;

        for(int i = 0; i < n; i++){
            a = scan.nextInt();
            b = scan.nextInt();
            c = scan.nextInt();
            d = scan.nextInt();

            flag = scan.next();
            if(flag.equals("YES")){
                res[a]++;
                res[b]++;
                res[c]++;
                res[d]++;
                check++;
            }else{
                res[a]--;
                res[b]--;
                res[c]--;
                res[d]--;
            }
        }

        for(int i = 0; i < 10; i++){
            if(res[i] == check){
                System.out.println(i);
                break;
            }
        }

    }
}