def quest(x):
    T=[i for i in range(1,N+1) if i!=x]
    print("?",N-1)
    print(*T)

    return int(input())

def answer(A):
    print("!",len(A))
    print(*A)
    exit(0)


N=int(input())
print(answer([i for i in range(1,N+1) if not quest(i)]))