# No.24 数当てゲーム
N = int(input())

s = input().split()
if s[-1] == 'NO':
    a = [1] * 10
    for i in range(4):
        a[int(s[i])] = 0
else:
    a = [0] * 10
    for i in range(4):
        a[int(s[i])] = 1

for i in range(1, N):
    s = input().split()
    if s[-1] == 'NO':
        for j in range(10):
            if str(j) in s[:4]:
                a[j] *= 0
    else:
        for j in range(10):
            if str(j) not in s[:4]:
                a[j] *= 0

for k in range(10):
    if a[k] == 1:
        print(k)