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;

namespace ITP1_8_A
{
	class Program
	{
		static void Main(string[] args)
		{
			string txt = Console.ReadLine();

			char[] cs = txt.ToCharArray();
			for(int i = 0; i < cs.Length; i++) {
				if(char.IsUpper(cs[i])) {
					cs[i] = char.ToLower(cs[i]);
				}
				else if(char.IsLower(cs[i])) {
					cs[i] = char.ToUpper(cs[i]);
				}
			}

			string ans = new string(cs);

			Console.WriteLine(ans);
		}
	}
}