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;
//using System.Collections;
//using System.Collections.Generic;
//using System.Linq;

namespace solution
{
  class Class1
  {
    static void Main()
    {
      string s = Console.ReadLine();
      char[] c = s.ToCharArray();
      for (int i = 0; i < c.Length; i++)
      {
        if (System.Char.IsUpper(c[i])) c[i] = char.ToLower(c[i]);
        else if (char.IsLower(c[i])) c[i] = char.ToUpper(c[i]);
      }
      Console.WriteLine(c);
    }
  }
}