TCO 2014 Round 1B (Almost) One-liner Solution in Python

"""
TCO 2014 Round 1B (Almost) One-liner Solution in Python
Although I'm sure this is absolutely unreadable at a glance, don't read further if you want to do it yourself.
"""

import functools

class SpamChecker(object):
    def spamCheck(self, judgeLog, good, bad):
        return (("" if functools.reduce((lambda x, y: (x[0] + (good if judgeLog[y] == "o" else -bad), x[1] | ((x[0] + (good if judgeLog[y] == "o" else -bad)) < 0))), range(len(judgeLog)), (0, 0))[1] else "NOT ") + SPAM")