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

### Tell us what’s happening:

Why is my code throwing an error even though I’m following every word so far?

``````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 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36`

What error are you getting?

If you mean the hint:

You should have `if number >= 10:` within the `for` loop.

This happens because the test is a bit too strict. You need to add spaces around the comparison operator here:

Just tried it. This is working. Thank you!!!

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