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.Collections.Generic;

class A
{
	public static void Main ()
	{

		char[] s = Console.ReadLine ().ToCharArray ();
		for (int i=0; i<s.Length; i++) {
			if (s [i] >= 65 && s [i] <= 90) {	//up
				s [i] += (char)32;
			} else if (s [i] >= 97 && s [i] <= 122) { //low
				s [i] -= (char)32;
			}
		}

		Console.WriteLine ( s );

	}
}