n,x,y=map(int,input().split())
if x==y:
    print(0)
    print("")
    exit()
if not y%2:
    print(-1)
    exit()
ans=[n]
s=bin(y)[2:]
i=0
while s[i]!='1':
    i+=1
k=[]
p=1
for i in range(len(s)-1):
    if s[i+1]=="1":
        k.append(p)
        p=1
    else:
        p+=1
k.append(p)
ans+=k
print(len(ans)-1)
for i in range(len(ans)-1):
    print(ans[i],end=" ")
print("")