import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class Test{

	public static void main(String[] args) {

		List<Human> humans = new ArrayList<Human>();
		humans.add(new Human(13));
		humans.add(new Human(33));
		humans.add(new Human(21));
		humans.add(new Human(21));
		Collections.sort(humans); 
		System.out.print(humans.get(0).age);
		System.out.print(humans.size()); 

	}

}

class Human implements Comparable<Human> {
	int age;

	public Human(int age) {
		this.age = age;
	}

	public int compareTo(Human h) {
		return h.age.compareTo(this.age);
	}

}
                                

A  333

B  334

C  133

D  134

E  Compilation fails