# Learn How to Work with Numbers and Strings by Implementing the Luhn Algorithm - Step 19

### Tell us what’s happening:

Can someone help explain what is wrong and what I need to do to fix it?

``````
# 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:
print(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/121.0.0.0 Safari/537.36 Edg/121.0.0.0`

### Challenge Information:

Learn How to Work with Numbers and Strings by Implementing the Luhn Algorithm - Step 19

Welcome to the forum @DrWumbo

This is what the error message is says:

Happy coding

It did not work, I don’t think thats the solution

``````for digit in odd_digits:
print(digit)
``````

This is correct.

Is it indented to be part of the function?

Yes it is, I am puzzled

The `for` loop doesn’t seem indented to be part of the function.

Can you paste the code for the full function?

``````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:
print(odd_digits)
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()
``````

Hi @DrWumbo

The error message: