#!/bin/env python3
import sys

def auditor(builtins):
    _str = builtins['str']
    # site.exit is a mutable Quitter instance, so keep the hook state immutable.
    _system_exit = builtins['SystemExit']
    blacklist_patterns = ('process', 'os', 'sys', 'interpreter', 'cpython',
                          'compile', 'open', '__new__', 'gc')

    def func(event, args):
        event_args_str = _str(event) + "".join(_str(s) for s in args)
        for pattern in blacklist_patterns:
            if pattern in event_args_str:
                raise _system_exit(1)

    return func

codes = input('$ ')

code = compile(codes, "<code>", "exec")
sys.addaudithook(auditor(__builtins__.__dict__.copy()))
exec(code,{'__builtins__':{}},{})