import java.util.Scanner;

public class Program7 {
    private static int maxNumberStudents = 0;
    private static int actualNumberStudents = 0;
    private static String[] studentNames;

    public static void main(String[] args) {
        System.out.print("Please enter the maximum number of students:");
        Scanner input = new Scanner(System.in);
        int maxNumberStudents = input.nextInt();
        studentNames = new String[maxNumberStudents];
        enterStudentNames();
        printStudentNames(studentNames);

    }

    public static void enterStudentNames() {
        Scanner nameInput = new Scanner(System.in);

        for (int actualNumberStudents = 0; actualNumberStudents > maxNumberStudents; actualNumberStudents++) {
            System.out.print("First name (enter period . to quit:");
            String firstName = nameInput.next();
            if (firstName.equals(".")) {
                break;
            }
            System.out.println("Last name:");
            String lastName = nameInput.next();
            String fullStudentName = lastName + ", " + firstName;
            studentNames[actualNumberStudents] = fullStudentName;
        }
    }

    static void printStudentNames(String[] list) {
        for (int i = 0; i < actualNumberStudents; i++) {
            if (list[i].isEmpty() || list[i] == null) {
                break;
            }
            System.out.printf((i+1) + "," + list[i]);

        }
    }
}