n, x, y = map(int, input().split())
if x == y:
    print(0)
    print()
    exit()

if y % 2 == 0:
    print(-1)
    exit()

A = []
b = 0
for i in range(1, n):
    if y >> i & 1:
        A.append(i - b)
        b = i


A.append(n)
A = A[::-1]
print(len(A))
print(*A)


for a in A:
    assert 1 <= a <= n
    x = ((x << a) + 1) % (1 << n)
assert x == y