N = int(input())
B = []
for b in range(N):
    A = [(a + 1) for a in range(N) if a != b]
    print("? " + str(len(A)))
    print(*A)
    ans = int(input())
    if not ans:
        B.append(b + 1)
print("! " + str(len(B)))
print(*B)