import java.util.*;
import java.util.List;
import java.util.Collection;

/**
 * Created by Daria on 28/03/2017.
 */
public class Sorting {

    public static class Contact implements Comparable<Contact> {

        String name;

        public Contact(String name) throws IllegalArgumentException{
            try{
                this.name = name;
            } catch(IllegalArgumentException contact) {
                throw contact;
            }
            System.out.println(toString());
        }

        public int compareTo(Contact o) {
            return name.compareTo(o.name);
        }

        public String toString() {
            return "Contact {" + "name: " + name + "}";
        }

    }
}