# Learn How to Work with Numbers and Strings by Implementing the Luhn Algorithm - Step 27

### Tell us what’s happening:

Describe your issue in detail here.

``````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):
print(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 Agent is: `Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0`

### Challenge Information:

Learn How to Work with Numbers and Strings by Implementing the Luhn Algorithm - Step 27

You appear to have created this post without editing the template. Please edit your post to Tell us what’s happening in your own words.

In general, put a space after the `if` keyword and don’t use parentheses if unnecessary. Also, the test is a bit strict here. You need to add spaces around the comparison operator (which is usually not required but can improve readability).

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