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)

gets.each_char {|b|
    if b>='a' && b<='z'
        print(b.upcase)
    elsif b>='A' && b<='Z'
        print(b.downcase)
    else
        print(b)
    end
}