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.Linq;
using System.Collections.Generic;

namespace Algorithm
{
    class Program
    {
        static void Main(string[] args)
        {
            var chars = Console.ReadLine();
            var result = new char[chars.Length];

            var count = 0;
            foreach (var c in chars)
            {
                if (char.IsUpper(c))
                {
                    result[count] = char.ToLower(c);
                }
                else if (char.IsLower(c))
                {
                    result[count] = char.ToUpper(c);
                }
                else
                {
                    result[count] = c;
                }
                count++;
            }

            Console.WriteLine(new string(result));

        }
    }
}