N = int(input())
numbers = [list(map(str,input().split())) for _ in range(N)]

ans = set([i for i in range(10)])
for n in numbers:
    if n[4] == "NO":
        for i in range(4):
            ans -= {int(n[i])}
    else:
        s = set([])
        for i in range(4):
            s.add(int(n[i]))
        ans &= s
print(*ans)