Reverse Case Conversion

You are given a string s. Your task is to convert each uppercase letter in s to its corresponding lowercase letter and each lowercase letter to its corresponding uppercase letter. Non-alphabetic characters should remain unchanged.

The transformation can be described mathematically as follows:

For each character \( c \) in the string:
if \( c \) is an uppercase letter, replace it with \( \text{tolower}(c) \);
if \( c \) is a lowercase letter, replace it with \( \text{toupper}(c) \);
otherwise, \( c \) remains unchanged.

Input will be provided via standard input (stdin) and output should be written to standard output (stdout).

inputFormat

The input consists of a single line containing the string s. The string may contain spaces, digits, and special characters.

outputFormat

Output the transformed string after reversing the case of each alphabetic character.

Hello World!

hELLO wORLD!