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;
class ITP1_8_A
{
    static void Main()
    {
        string ipt = Console.ReadLine();
        string opt = "";
        for (int i = 0; i < ipt.Length; i++)
            if (char.IsUpper(ipt, i)) opt += char.ToLower(ipt[i]);
            else if (char.IsLower(ipt, i)) opt += char.ToUpper(ipt[i]);
            else opt += ipt[i];
        Console.WriteLine(opt);
    }
}