// implement threads

class Data extends Thread {
    int k;

    //constructor
    Data(int k) {
	this.k = k;
    }

    //run method, which must be overridden
    public void run() {
	for(int i=1;i<=10;i++)
	    System.out.print(k);
    }

}


public class thread1 {
    
    //main method
    public static void main(String args[]) {	
	Data a = new Data(1);
	Data b = new Data(2);
	a.start();
	b.start();
    }

}

//Output should mix up the order of 1s and 2s.