You can pry "Sphynx of black quartz, hear my vow" from my cold dead hands.
Just for fun, the JavaScript one-liner I used to check:
const check = str => [...Array(26)].map((t, i) => String.fromCharCode("a".charCodeAt(0) + i)).filter(l => str.indexOf(l) < 0) "qwertyuiopasdfghjklzxcvbnm".split("") str => [...Array(26)].every((e, i) => str.indexOf(String.fromCharCode(97 + i)) >= 0)