Java вопрос, пожалуйста, помогите! !

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Я учу java но застрял на первом тесте в школе пожалуйста помогите мне,

пакет Привет, мир!

/**
*
* @author NETBEANS помещает ваши инициалы здесь
*/


импорт java.util.Сканер;

общественный класс HelloWorld {

публичный статический пустота главный(строка[] аргументы) {
//

package prg420week1_codingassignment;

/**
 *
 * @author NETBEANS PLACES YOUR INITIALS HERE
 */


import java.util.Scanner;

public class PRG420Week1_CodingAssignment {
    
    public static void main(String[] args) {
        // Create a usable instance of an input device    
        LINE 1. INSTANTIATE AN INSTANCE OF SCANNER AND ASSIGN IT TO A VARIABLE OF TYPE SCANNER. 

        // Prompt user for input
        LINE 2. USE THE PRINT() METHOD TO PROMPT THE USER FOR HIS OR HER FIRST NAME.

        // Capture first word and assign it to A VARIABLE
        LINE 3. USE THE NEXT() METHOD OF YOUR SCANNER INSTANCE TO ASSIGN A VALUE TO A STRING VARIABLE.

        // Construct the greeting 
        LINE 4. USE THE PRINTLN() METHOD TO CONSTRUCT A CORRECTLY PUNCTUATED GREETING.

    }
    
}

What I have tried:

<pre>public static void main(String[] args) {


    // Create a usable instance of an input device
    Scanner sc = new Scanner(System.in);
    // Prompt user for input
    System.out.println("Please enter you first name:");
    // Capture first word and assign it to A Variable
    String firstName;
    firstName = sc.next();
    //Construct the greeting
    System.out.println("Hello, " + sc.next() + "!");

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