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)

str = STDIN.gets

0.upto(str.length-1) {|i|
	if str[i] =~ /[A-Z]/ then
		print str[i].downcase
	elsif str[i] =~ /[a-z]/ then
		print str[i].upcase
	else
		print str[i]
	end
}