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[] args)
    {
        char[] strInput = Console.ReadLine().ToCharArray();

        foreach (char c in strInput)
        {
            if (char.IsLower(c))
            {
                Console.Write(char.ToUpper(c));
            }
            else if (char.IsUpper(c))
            {
                Console.Write(char.ToLower(c));
            }
            else
            {
                Console.Write(c);
            }
        }
        Console.WriteLine();
    }
}