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: Wrong Answer)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            string a = Console.ReadLine();
            string b = "abcdefghijklmnopqrsyuvwxyz";
            string c = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
            int d = a.Length;
            int f;
            for (int e = 0; e < d; e++)
            {
               for( f =0;f!=26;f++)
                {
                   
                    if (a[e] == b[f]) { Console.Write(c[f]); break; }
                    else if (a[e] == c[f]) { Console.Write(b[f]); break; }
                   
                }
              if(f==26)   Console.Write(a[e]); 
            }
            Console.Write("\n");


        }
    }
}