import sys

input = sys.stdin.readline


def main():
    N = int(input())
    ans = set(range(10))
    for i in range(N):
        *a, b = input().split()
        if b == 'YES':
            ans &= set(map(int, a))
        else:
            ans -= set(map(int, a))

    print(*ans)


if __name__ == '__main__':
    main()