Project Engineer

You are given a non-empty string ‘STR’, consisting of both lowercase and uppercase English alphabetical letters. Your task is to convert the characters of the string into the opposite case, i.e. if a character is in lower case then convert it into the upper case and vice-versa.

For Example:

If STR = ‘aBc’,
After converting ‘a’ to ‘A’, ‘B’ to ‘b’, and ‘c’ to ‘C’ we got our final string as ‘AbC’.

You are given a string 'S'. Your task is to check whether the string is palindrome or not. For checking palindrome, consider alphabets and numbers only and ignore the symbols and whitespaces.

Note :

String 'S' is NOT case sensitive.

Example :

Let S = “c1 O$d@eeD o1c”.
If we ignore the special characters, whitespaces and convert all uppercase letters to lowercase, we get S = “c1odeedo1c”, which is a palindrome. Hence, the given string is also a palindrome.