Why this code dont work

Question

https://code.sololearn.com/W2cFUltlSG7m/?ref=app

Answer 1

Abbakar_ah💻💻 this is working fine .

Answer 2

Abbakar_ah💻💻 I don't know why it doesn't work but I could say that actually SL doesn't support <datalist> tag
I tried that but it doesn't work also.

Instead you may use/try <select> with <optgroup>

Check this out! 👇👇

https://code.sololearn.com/WQpxHBVGkL6O/?ref=app