Python: >>> phrase = "Fjord zoologists quip jovially, waxing lyrical about xanthic lutrines" >>> import string >>> set(string.ascii_lowercase) - set(phra

Python: >>> phrase = "Fjord zoologists quip jovially, waxing lyrical about xanthic lutrines" >>> import string >>> set(string.ascii_lowercase) - set(phrase.lower()) {'k', 'm'}