N, X, Y = map(int, input().split())
if X > 0 and Y == 0:
	exit(print(-1))
if X == Y:
	print(0)
	exit(print())
ans = [N]
x = [i for i in range(N) if Y & (1 << i)]
ans += [x[i + 1] - x[i] for i in range(len(x) - 2, -1, -1)]
print(len(ans))
print(*ans)