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 Program
{
    static void Main()
    {
        string s = Console.ReadLine();
        char[] c = new char[s.Length];
        c = s.ToCharArray();
        if (s.Length < 1200)
        {
            for(int i = 0;i < c.Length; i++)
            {
                if (char.IsUpper(c[i])) 
                {
                    c[i] = char.ToLower(c[i]);
                }else if(char.IsLower(c[i]))
                {
                    c[i] = char.ToUpper(c[i]);
                }
            }
        }
        string s2 = new string(c);

        Console.WriteLine(s2);
    }
}