Until they type stop · ⁨จนกว่าพวกเขาจะพิมพ์ stop⁩

Until they type stop

Keep reading words with input() and printing each one back, until the word is stop. Do not print stop itself.

The value the loop tests has to be read before the loop starts, and read again at the end of every turn — otherwise the same word is tested for ever. != means is not equal to.