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

### Tell us what’s happening:

Hey guys, need some help with indentation problem. Here is my code:

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)

``````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()
``````

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### Challenge Information:

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

Hi there and welcome to our community!

Your `print` command should be indented inside the `if` statement.
You’ll also need to remove the space before the colon.

1 Like

Every block of code needs to be indented. There are no curly braces to indicate what is part of a loop or function, the syntax is indentation.

``````code
code

def function():
code
code
for this in that:
code

if this == that:
code
code

code
code

code
code

``````
1 Like