## final version L02T09

def leet_speak(words):
    return words.replace("e","3").replace("l","1").replace("o","0").replace("t","7")


def tests(f):
    inputs = [['leet'], ['do not want']]
    outputs = ['1337', 'd0 n07 wan7']

    for input, output in zip(inputs, outputs):
        if f(*input) != output:
            return "ERROR: {}!={}".format(f(*input), output)
            break
    return "TESTS PASSED"

if __name__ == "__main__":
    print(tests(leet_speak))