n = int(input())
num = [True] * 10

for _ in range(n):
    ques = input().split()
    abcd = list(map(int, ques[:4]))
    for i in range(10):
        if ques[4] == 'YES':
            num[i] &= True if i in abcd else False
        else:
            num[i] &= False if i in abcd else True
print(num.index(True))