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public class Main
{
	public static void main(String[] args) {
		System.out.println("Hello World");
		public class test {
        public static void main(String[] args) {
        MyThread mt1 = new MyThread("thread1", "ping");
        MyThread mt2 = new MyThread("thread2", "pong");
        mt1.start();
        mt2.start();
}
}
		
	}
}

class MyThread extends Thread {
private String name, msg;
public MyThread(String name, String msg) {
this.name = name;
this.msg = msg;
}
public void run() {
System.out.println(name + " starts its execution");
for (int i = 0; i < 5; i++) {
System.out.println(name + " says: " + msg);
try {
Thread.sleep(5000);
} catch (InterruptedException ie) {}
}
System.out.println(name + " finished execution");
}
}