package second;

public class A extends Thread {

    public void run(){

        for(int i = 1;i <= 10 ; i++){

            for(int y=1;y<=i;y++){

                System.out.print("*");

            }

            System.out.println();

        }

    }

    public static void main(String args[]){

        A a1 = new A();

        A a2 = new A();

        A a3 = new A();

        a1.start();

        a2.start();

        a3.start();

    }

}