#Digital eigenvalue.py
number = eval(input())
count = 0
Ob = 0
Ox = 0
while number > 0:
Ob = number % 10
count += 1
if Ob%2 == count%2:
Ox += pow(2,count-1)
number = number // 10
print(Ox)原文：https://www.cnblogs.com/xuefangzhou/p/9879027.html