n,x,y=map(int,input().split())

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

t=[]
for i in range(n):
    if y>>i&1:
        t.append(i)
# print(t)
t.reverse()
ans=[n]

for i in range(len(t)-1):
    ans.append(t[i]-t[i+1])

print(len(ans))
print(*ans)