What is encrypted, decrypted, and unencrypted?

Suppose you want to send a secret message to your friend. Since you don’t want anyone else to read the message, you and your friend decide on a code. For example, A is 1, B is 2. You decide that space should be indicated by a semi-colon, and a comma separates two letters. So, “Come Home” becomes 3,15,13,5;8,15,13,5.