n = int(input())
p = [0 for _ in range(10)]
for _ in range(n):
    tmp = input()
    tmp = tmp.rsplit(' ',1)
    num_list = [int(x) for x in tmp[0].split()]
    if tmp[1] == "YES":
        for x in range(10):
            if x in num_list:
                pass
            else:
                p[x] = -1
    elif tmp[1] == "NO":
        for x in num_list:
            p[x] = -1
print(p.index(0))