# Learn String Manipulation by Building a Cipher - Step 86

### Tell us what’s happening:

Stuck and need a hint! Thanks

``````text = 'mrttaqrhknsw ih puggrur'
custom_key = 'python'

def vigenere(message, key, direction=1):
key_index = 0
alphabet = 'abcdefghijklmnopqrstuvwxyz'
final_message = ''

for char in message.lower():

# Append any non-letter character to the message
if not char.isalpha():
final_message += char
else:
# Find the right key character to encode/decode
key_char = key[key_index % len(key)]
key_index += 1

# Define the offset and the encrypted/decrypted letter
offset = alphabet.index(key_char)
index = alphabet.find(char)
new_index = (index + offset*direction) % len(alphabet)
final_message += alphabet[new_index]

return final_message

def encrypt(message, key):
return vigenere(message, key)

def decrypt(message, key):
return vigenere(message, key, -1)

/* User Editable Region */

encryption = encrypt(text, custom_key)
print('Encrypted text: ' + text)
print('Key: ' + custom_key)
decryption = decrypt(encryption, custom_key)
print('Decrypted text: ' + decryption)

/* User Editable Region */

``````

User Agent is: `Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36`

### Challenge Information:

Learn String Manipulation by Building a Cipher - Step 86

Delete `encryption` and pass `text` as the first argument to `decrypt`.

Can you ask a more specific question? Not quite sure how to help.

`decrypt` is passed two arguments, `encryption` and `custom_key`. The first argument is `encryption`.

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