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

### Tell us what’s happening:

Can some give me the solution plz i am not able to do this

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# User Editable Region

1
Jan 4
Does anyone know what is wrong with my code, and what number(s) I am suppossed to put in to make the card_number value valid again.

My code 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)

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
total = sum_of_odd_digits + sum_of_even_digits

def main():
card_number = '4111-1111-4555-1141'
card_translation = str.maketrans({'-': '', ' ': ''})
translated_card_number = card_number.translate(card_translation)

if verify_card_number(translated_card_number):
print('VALID!')
else:
print('INVALID!')

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

You need to change this variable. Do you know what the algorithm you just made is checking for?

``````total = sum_of_odd_digits + sum_of_even_digits
``````>>> 49