class Persion {    private String first_name;    private String middle_name;    private String last_name;    public Persion(String first_name, String last_name) {        this.first_name = first_name;        this.last_name = last_name;    }    public Persion(String first_name, String middle_name, String last_name) {        this.first_name = first_name;        this.middle_name = middle_name;        this.last_name = last_name;    }    public void input() {        if (this.middle_name == null) {            System.out.println(this.first_name + this.last_name);        } else {            System.out.println(this.first_name + this.middle_name + this.last_name);        }    }}public class Main {    public static void main(String[] args) {        Persion p = new Persion("aidehua", "kali", "santuo");        p.input();    }}