#include <iostream>
#include <vector>
#include <string>
#define repeat(i,n) for(int i = 0; (i) < (n); ++ (i))
using namespace std;
typedef unsigned long ul;

int main() {
    vector<bool> is_correct(10, true);

    int n;
    cin >> n;

    repeat(i,n) {
        int a, b, c, d;
        string r;
        cin >> a >> b >> c >> d >> r;

        if (r == "YES") {
            repeat(j,10) {
                if (a != j && b != j && c != j && d != j) {
                    is_correct[j] = false;
                }
            }
        } else {
            is_correct[a] = false;
            is_correct[b] = false;
            is_correct[c] = false;
            is_correct[d] = false;
        }
    }

    repeat(j,10) {
        if (is_correct[j]) {
            cout << j << endl;
            break;
        }
    }

    return 0;
}