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: WA: Presentation Error)

input = gets.chomp.split("")

input.each do |i|
    if i.between?("a","z")
        i.upcase!
    elsif i.between?("A","Z")
        i.downcase!
    end
end

print input.join("")