n = int(input())
ans = []
for i in range(n):
    if 2 ** i > n:
        break
    if 1 & (n >> i):
        ans.append(2 ** i)
xor = 0
summ = 0
for v in ans:
    xor ^= v
    summ += v

if xor == n and summ < 2 * n:
    print(len(ans))
    print(*ans)
else:
    print(-1)