import java.util.Scanner;

class Main {
    public static void main(String[] args) throws Exception {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int[] a = new int[n];
        int[] b = new int[n];
        int[] c = new int[n];
        int[] d = new int[n];
        String[] r = new String[n];
        for(int i=0; i<n; i++) {
            a[i] = in.nextInt();
            b[i] = in.nextInt();
            c[i] = in.nextInt();
            d[i] = in.nextInt();
            r[i] = in.next();
        }

        boolean[] bool = new boolean[10];
        for(int i=0; i<n; i++) {
            if(r[i].equals("YES")) {
                for(int j=0; j<10; j++) {
                    if(j == a[i] || j == b[i] || j == c[i] || j == d[i]) {
                        continue;
                    }
                    bool[j] = true;
                }
            } else if(r[i].equals("NO")) {
                bool[a[i]] = bool[b[i]] = bool[c[i]] = bool[d[i]] = true;
            }
        }

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