Exception

import java.io.*;

class ExceptionClass extends Exception

{

            String Error;

            ExceptionClass(String ErrorMsg)

            {

                        super(ErrorMsg);

                        Error=ErrorMsg;

            }          

            public String toString()

            {

                        return "ExceptionClass :: { " + Error + "} ";

            }

}

class ExClass

{

            public static void main(String args[]) //throws Exception

            {

                        try

                        {

                                    InputStreamReader isr=new InputStreamReader(System.in);                                

                                    BufferedReader br=new BufferedReader(isr);     

                                    int a=Integer.parseInt(br.readLine());

                                    int b=Integer.parseInt(br.readLine());

                                    if(b==0)

throw new ExceptionClass("Oops ! This division is not possible. Please Try Again !!!");   

                                    if((a-b)<=0)

throw new ExceptionClass("Oops ! (a-b) should always be greater than 0 !!!");                                                     

                                    if(a<100 || b<100 )

                                                throw new ExceptionClass("a and b should be greater than 100  !!!");                                                                              

                        }

                        catch(ExceptionClass e)

                        {

                                    System.out.println("Exception generated : \n" +e);

                        }

                        catch(Exception e)

                        {

                                    System.out.println("System generated Exception : \n" +e.getMessage());

                        }

            }

}