n,x,y=map(int,input().split())
if x==y:
    print(0)
    print()
    exit()
if y%2==0:
    print(-1)
    exit()
s=str(bin(y))[2:]
#print(s)
X=[]
for i in range(len(s)):
    if s[i]=="1":
        X.append(i)
Ans=[n]
for i in range(len(X)-1):
    Ans.append(X[i+1]-X[i])
print(len(Ans))
print(*Ans)