Write a program to check whether a string entered is a palindrome. A string is a palindrome if it reads the same forward and backward. The words “mom, ‘dad”, “noon” for instance are palindromes. (include type annotations for all functions except for main, the python reverse() method is not allowed to be used with this program) 1. write a function def isPalindrome() to check if the string entered is a palindrome.2. write the main() function to allow the user to enter the string and prints if it is a palindrome or not. 3. Use at least 4 test cases 2 for true and 2 for false.