# Learn How to Work with Numbers and Strings by Implementing the Luhn Algorithm - Step 21

### Tell us what’s happening:

i dont know how exactly to write the code in a readable way

``````def verify_card_number(card_number):
sum_of_odd_digits = 0
card_number_reversed = card_number[::-1]
odd_digits = card_number_reversed[::2]

# User Editable Region

for digit in odd_digits:
sum_of_odd_digits += digit
print(sum_of_odd_digits)

# User Editable Region

def main():
card_number = '4111-1111-4555-1142'
card_translation = str.maketrans({'-': '', ' ': ''})
translated_card_number = card_number.translate(card_translation)

verify_card_number(translated_card_number)

main()
``````

User Agent is: `Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36`

### Challenge Information:

Learn How to Work with Numbers and Strings by Implementing the Luhn Algorithm - Step 21

Convert the `digit` variable to an integer before adding it

Check the given example for how to do that using the `int()` function.

move the `print` call to the end of the `verify_card_number` function

`print()` is still in the for loop, you need to move it out of the for loop so it executes when the for loop is complete.