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: WA: Presentation Error)

using System;

namespace Project
{
	class MainClass
	{
		public static void Main(string[] args)
		{
			string str = Console.ReadLine();
			string S = str.ToUpper();
			string s = str.ToLower();
			char[] c = new char[str.Length];
			for (int i = 0; i < str.Length; i++)
			{
				if (str[i] != S[i]) { c[i] = S[i]; }
				else
				{
					if (str[i] != s[i]) { c[i] = s[i]; }
					else { c[i] = str[i]; }
				}
			}
			for (int i = 0; i < str.Length; i++)
			{
				Console.Write(c[i]);
			}
		}
	}
}