Anyone can Do it using Ascii codes. I dare you - "Try to not use ascii codes." ;)

[saad_0084 (Saad Alam)]

Hi, I solved using ch>=‘a’ && ch<=‘z’ this concept, is there any other way to solve this problem.

[aa1 (Abha Agrawal)]

you can use functions like islower() and isupper();
or you can directly compare them like ( alpha>=‘a’ and char<=‘z’ )