Problem:
Toggling Cases

Write a program which converts uppercase/lowercase letters to lowercase/uppercase for a given string.

Input

A string is given in a line.

Output

Print the converted string in a line. Note that you do not need to convert any characters other than alphabetical letters.

Constraints

The length of the input string < 1200

Sample Input

fAIR, LATER, OCCASIONALLY CLOUDY.

Sample Output

Fair, later, occasionally cloudy.

Solution in Ruby (judge verdict: Accepted)

input = STDIN.gets

input.chars{|c|
        if c.match(/[a-z]/) != nil then
                print c.upcase
        elsif c.match(/[A-Z]/) != nil then
                print c.downcase
        else
                print c
        end
}