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;
public class Hello{
    public static void Main(){
        // Your code here!
        string line = Console.ReadLine();
        
        for(int i=0; i<line.Length; i++){
            if(char.IsLower(line[i])){
                Console.Write(char.ToUpper(line[i]));
            }else if(char.IsUpper(line[i])){
                Console.Write(char.ToLower(line[i]));
            }else{
                Console.Write(line[i]);
            }
        }

    }
}