possible = {i for i in range(1, int(input()) + 1)}
data = input()
betset = set()
while data != "HELP":
    if data.isalpha():
        if data == "NO":
            possible -= betset
        else:
            possible = possible & betset
    else:
        betset = set(list(map(int, data.split())))
    data = input()
print(*sorted(possible))