# -*- coding:utf-8 -*-
if __name__ == '__main__':
    prospect = set(range(10))
    l = []
    n = int(input())
    for i in range(n):
        a, b, c, d, r = input().split()
        l.append((set(map(int, (a, b, c, d))), r))
    for s in l:
        if s[1] == "YES":
            prospect &= s[0]
            pass
        elif s[1] == "NO":
            prospect -= s[0]
    print(prospect.pop())