import java.util.*;
import java.lang.*;
import java.io.*;
class InvalidAgeException extends Exception
{
InvalidAgeException(String s)
{
super(s);
}
}
class Demo
{
static void validate(int age) throws InvalidAgeException
{
if(age<18)
{
throw new InvalidAgeException("Not Valid");
}
else
{
System.out.println("Welcome to Vote");
}
}
public static void main(String args[]) 
{  
try
{  
validate(13); 
}
catch(Exception m)
{
System.out.println("Exception occured: "+m);
}
}
}

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