Which Base is it Anyway?

ID: whichbase

Difficulty: 2.6

CPU Time: 1 second

Memory: 1024 MB

Solution

For this, using a language that lets you easily convert bases will help a lot. Any of the inputs can be interpreted as hex, so those can just be converted. If the string contains an 8 or 9, it could not possibly be an octal number, and so that can be detected and output as 0 instead.