Number carries

Question

Two integer numbers are added using the column addition method. When using this method, some additions of digits produce non-zero carries to the next positions. Your task is to calculate the number of non-zero carries that will occur while adding the given numbers.

The numbers are added in base 10.

Here is my code.
I want to make the len(a) the last digit of a.
And it gives some back an error...
Please help me with how to fix it if possible!!!

THANK U

Answer 1

Where is the code?

Answer 2

say a is 12345.
the last digit 5 is a%10
while 1234 is a//10

Answer 3

...nvm