Runtime error on CodeChef editor but it's running perfectly on PyCharm

Problem: CodeChef | Competitive Programming | Participate & Learn

My code: -

image

Error being shown: -

Runtime Error
NZEC

Error
Traceback (most recent call last):
File “prog.py”, line 3, in
File “”, line 1
a?c
^
SyntaxError: invalid syntax

It’s running perfectly on PyCharm, but it’s giving an error on the codechef editor.
Please help

The PYTH language in Codechef refers to Python 2. You need to select PYTH3 to run it.