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 ITP1_8_A
{
    class Program
    {
        static void Main(string[] args)
        {
            string str = Console.ReadLine();
            foreach (var c in str)
            {
                if (char.IsLower(c)) Console.Write(char.ToUpper(c));
                else if (char.IsUpper(c)) Console.Write(char.ToLower(c));
                else Console.Write(c);
            }
        }
    }
}