isbn12 = input("enter isbn:")
sum1 = 0
sum2 = 0
for index in range(0,12,2):
    tem[ = int()]
a8ff887345054f2c9b48a17470296b995299221a
isbn12 = input("enter isbn:")
sum1 = 0
sum2 = 0
for index in range(0,12,2):
    tem[ = int()]