import java.util.Scanner;

import java.util.SplittableRandom;

import java.util.ArrayList;

public class Main {

public static void main(String[] args) {

ArrayList<Student> students = new ArrayList<>();

Scanner sc = new Scanner(System.in);

for (int i = 0; i < 4; i++) {

addstudent(students);

}

ArrayList<Student> result= shaixuanstudent(students);

for (int i = 0; i < result.size(); i++) {

System.out.println(result.get(i).getName());

}

for (int i = 0; i < students.size(); i++) {

System.out.println(students.get(i).getName());

}

}

public static void addstudent(ArrayList<Student> students) {

Scanner sc = new Scanner(System.in);

System.out.println("请输入学生名字");

String name = sc.next();

System.out.println("请输入学生年龄：");

int age = sc.nextInt();

Student stu =new Student(age,name);

students.add(stu);

}

public static ArrayList<Student> shaixuanstudent(ArrayList<Student> students) {

ArrayList<Student> result = new ArrayList<Student>();

Student stu = new Student(0,"null");

for (int i = 0; i < students.size(); i++) {

if (students.get(i).getAge() <=18) {

stu= students.remove(i);

i--;

result.add(stu);

}

}

return result;

}

}