# Learn How to Work with Numbers and Strings by Implementing the Luhn Algorithm - Step 35

### Your code so far

``````
/* User Editable Region */

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

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

/* User Editable Region */

sum_of_even_digits = 0
even_digits = card_number_reversed[1::2]
for digit in even_digits:
number = int(digit) * 2
if number >= 10:
number = (number // 10) + (number % 10)
sum_of_even_digits += number

/* 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 Editable Region */

``````

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### Challenge Information:

Learn How to Work with Numbers and Strings by Implementing the Luhn Algorithm - Step 35

Hello khaledhamida,

It looks like you removed all the print statements, and even the if/else statements in the main function. I would advise to reset the code and after you make the `card_number` valid again only remove the print statement from the `verify_card_number` function.

1 Like

it works. Thanks a lot

2 Likes

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