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.Globalization;

class program
{
    public static void Main()
    {
        char[] str = Console.ReadLine().ToCharArray();

        for (int i = 0; i < str.Length; i++)
        {
            if (str[i] >= 'a' && str[i] <= 'z')
            {
                Console.Write(str[i].ToString().ToUpper());
            }
            else if (str[i] >= 'A' && str[i] <= 'Z')
            {
                Console.Write(str[i].ToString().ToLower());
            }
            else
            {
                Console.Write(str[i]);
            }
        }
        Console.WriteLine();
        
    }
}