public class main{
    public static void main (String[] args){
        Runner1 runner1 = new Runner1();
        Runner2 runner2 = new Runner2();
        runner1.execute();
        runner2.execute();
        }
        }

        class Runner1 {
    public void execute(){
        for (int i=0; i<10; ++i)
            System.out.println("I am Runner1 " + i);
    }
        }
class Runner2 {
    public void execute(){
        for (int i=0; i<10; ++i)
            System.out.println("I am Runner2 " + i);
    }
}