Flip Case and Reverse

You are given a string S. Your task is to flip the case of each alphabetical character in the string and then reverse the entire string.

The transformation should be done as follows:

• If a character is in lowercase, convert it to uppercase.
• If a character is in uppercase, convert it to lowercase.
• Non-alphabetical characters remain unchanged.

After flipping the case of every character, the resulting string should be reversed. Mathematically, if the transformation is denoted by \( f(S) \), then:

\[ f(S) = \text{reverse}(\text{flip}(S)) \]

For example, given the input Hello World!, the output should be !DLROw OLLEh.

inputFormat

The input consists of a single line that contains a non-empty string S. The string may include alphabets, digits, and special characters.

outputFormat

Output a single line containing the resultant string after flipping the case of each character and then reversing the string.

## sample

Hello World!

!DLROw OLLEh