N = int(input())
f = set([1,2,3,4,5,6,7,8,9,0])
n = set()
y = set()

for i in range(N):
    K = input().split()
    A = set(map(int, K[0:4]))
    R = K[4]
    if R == "YES":
        if len(y) == 0:
            y = A
        else:
            y = (y & A) - n
    else:
        n.update(A)

if len(y - n) == 1:
    print(str(y - n)[1])
else:
    print(str(f - n)[1])