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 C# (judge verdict: Accepted)

using System;

class ITP1_8_A
{
  static void Main()
  {
    char[] s = Console.ReadLine().ToCharArray();
    for (int i = 0; i < s.Length; i ++)
    {
      if (char.IsUpper(s[i])) s[i] = char.ToLower(s[i]);
      else s[i] = char.ToUpper(s[i]);
    }
    Console.WriteLine(s);
  }
}