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;

namespace _8_A
{
    class Program
    {
        static void Main(string[] args)
        {
            var s = Console.ReadLine();
            var cs = s.ToCharArray();
            for(var i=0;i<s.Length;i++)
            {
                if(char.IsUpper(cs[i]))
                {
                    cs[i] = char.ToLower(cs[i]);
                }
                else
                {
                    cs[i] = char.ToUpper(cs[i]);
                }
            }
            var s2 = new String(cs);
            Console.WriteLine(s2);
        }
    }
}