Even a response that looks like a number can arrive as text. "12" + "3" joins strings into "123"; int("12") + 3 produces 15. float("2.5") reads decimal text. str(15) makes text from a number; int(3.9) truncates toward zero rather than rounding. Invalid numeric text, such as "three", raises ValueError—use known valid values for now.
A market's order count is supplied as a prefilled string. Change only order_text from "12" to "15". Edit main.py, press Run to see Items: 17, then Submit. In the next exercise you will convert other strings yourself.
order_text to the string "15"; the existing conversion and addition must display 17.