import sys
input = sys.stdin.readline
N,X,Y=map(int,input().split())
if X==Y:
  print(0)
  ans=[]
  print(*ans)
  exit()
if Y%2==0:
  print(-1)
  exit()
ans=[]
ans.append(N)
S=bin(Y)[2:]
c=0;f=0
for s in S:
  c+=1
  if s=='1':
    if f==0:
      f=1
    else:
      ans.append(c)
    c=0 
print(len(ans))
print(*ans)