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.Drawing;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
using System.Text;

namespace Fish.aizu
{
	public static class AizuOnlineJudge
	{
		public static int[] SplitToInts(string line)
		{
			return line.Split(' ').Select(x => int.Parse(x)).ToArray();
		}
		public static double[] SplitToDoubles(string line)
		{
			return line.Split(' ').Select(x => double.Parse(x)).ToArray();
		}
		public static long[] SplitToLongs(string line)
		{
			return line.Split(' ').Select(x => long.Parse(x)).ToArray();
		}
		public static int Main()
		{
			Compute(Console.In, Console.Out);
			return 0;
		}
		
		public static void Compute(TextReader reader, TextWriter writer)
		{
			var line = reader.ReadLine();
			var stringBuilder = new StringBuilder(1200);
			foreach (var c in line)
			{
				char cc = default(char);
				if (char.IsLower(c))
				{
					cc = char.ToUpper(c);
				}
				else 
				{
					cc = char.ToLower(c);
				}
				stringBuilder.Append(cc);
			}
			writer.WriteLine(stringBuilder.ToString());
		}
	}
}