Off Topic Cryptanalysis and Cryptography questions !

[oliver21a]

Hi, I wanted to know if anyone can help me find an "encryption" method with a given input and output text. I don't know what is the key or the method itself but it look like some kind of ROT Cypher or shifting carachters thing ! I wanted to know if software or python code exists for my problem, finding a decryption key with input and output ? Thanks The texts : "Input" = KEcYlDQNWs7-ip3ZUBIBALHpscNS0G "Output" = H7oEfyu72C-c49QivKbulQa2QLpyLM