N = int(input())
vals = set([str(v) for v in range(10)])

for _ in range(N):
    l = list(map(str, input().split()))
    if l[4] == 'NO':
        vals = vals - {l[0], l[1], l[2], l[3]}
    else:
        vals = vals & {l[0], l[1], l[2], l[3]}
for v in vals:
    print(v)