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[] args){
        string str = Console.ReadLine().Trim();
        char[] cs = str.ToCharArray();
        foreach(char s in cs){
            if(char.IsUpper(s)){
                Console.Write(char.ToLower(s));
            } else if(char.IsLower(s)){
                Console.Write(char.ToUpper(s));
            } else {
                Console.Write(s);
            }
        }
        Console.WriteLine();
    }
}