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: Wrong Answer)

s = gets.chomp
table = Hash[*[*'a'..'z'].zip([*'A'..'Z']).flatten]
table = table.merge(table.invert)
s.each_char do |c|
    print table[c]
end
puts