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)

big = [*'A'..'Z']
sma = [*'a'..'z']

h = Hash[*[big, sma, sma, big].transpose.flatten]

gets.split('').each do |c|
  print h.key?(c) ? h[c] : c
end