This Script will Encrypted and Decrypted your text.
python3 substitution_cypher.py
It will ask whether you want to encode or decode your text.
1.)Enter 0 for Encryption.
2.)Enter 1 for Decryption.
3.)If you choose for 0 for encryption it will ask for Text which you want to encrypt and key using which you want to encrypt.
4.)If you choose for 1 for encryption it will ask for Text which you want to decrypt and key using which you want to decrypt.