count = 0
math = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
turn = input()
turn = int(turn)
while turn != count:
    yes_or_no = input()
    answer = input()
    if answer == 'NO':
        for i in len(answer):
            math.remove(answer[i])
    else:
        
        math.extend(answer)
    count = count + 1
print(math)