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

    print(*numbers)

if __name__ == '__main__':
    main()