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 Problem {
    public static void Main() {
        var str = Console.ReadLine();
        foreach (var c in str)
            Console.Write(char.IsLower(c) ? char.ToUpper(c) :
                          char.IsUpper(c) ? char.ToLower(c) : c);
        Console.WriteLine();
    }
}