import sys
input = sys.stdin.readline
N, X, Y = map(int, input().split())
A = []
if X==Y:
    print(len(A))
    print(*A)
    exit()
if Y%2==0:
    print(-1)
    exit()
b = bin(Y)[2:]
A.append(N)
i = 0
while i<len(b):
    j = i+1
    while j<len(b) and b[j]=="0":
        j+=1
    if j<len(b):
        A.append(j-i)
    i = j
print(len(A))
print(*A)