N, X, Y = map(int, input().split())
if X == Y:
    print(0)
    exit()
if Y % 2 == 0:
    print(-1)
    exitr()
SY = ("0" * N + f'{Y:b}')[-N:]
A = []
d = -1
for i in range(N):
    if SY[i] == "1":
        A.append(i - d)
        d = i
print(len(A))
print(*A)