Checks whether the input string is a palindrome or not. Checks for both even and odd length palindromes. Strings containing only characters a and b are accepted.
Checks whether the input number is divisible by 3. Accepts a non-negative integer. No need to input +/- sign.
Checks for the language a^n*b^n*c^n, where n>=1. Accepts only a, b and c as input charachters. Accepts only a's followed by b's followed by c's of the same length.