Decrypt the ciphertext fbkeykleiinr

We know that the key 'firewall' was used for encryting the original message using the Vigenere Encryption Algorithm.

Recover the plaintext associated to that ciphertext?.

Note: The aphabet used was $\{$a:$0,$ b:$1,$ c:$2,...,$ z:$25\}$

Draw out the process with the needed alphabet whether on paper or computer