I figured it out

    /* Declare second integer, double, and String variables. */
    int j;
    double l;
    String m;
    /* Read and save an integer, double, and String to your variables.*/

    j=scan.nextInt();

    l=scan.nextDouble();

    m=scan.next();
    // Note: If you have trouble reading the entire String, please go back and review the Tutorial closely.

    /* Print the sum of both integer variables on a new line. */
    System.out.println(i+j);

    /* Print the sum of the double variables on a new line. */
    System.out.println(d+l);
    /* Concatenate and print the String variables on a new line; 
        the 's' variable above should be printed first. */
    String k=scan.nextLine();
    System.out.println(s+m+k);

hello! I don't see where is the problem in my code

   /* Declare second integer, double, and String variables. */
    int j;
    double l;
    String m;
    /* Read and save an integer, double, and String to your variables.*/

    j=scan.nextInt();

    l=scan.nextDouble();

    m=scan.nextLine();
    // Note: If you have trouble reading the entire String, please go back and review the Tutorial closely.

    /* Print the sum of both integer variables on a new line. */
    System.out.println(i+j);

    /* Print the sum of the double variables on a new line. */
    System.out.println(d+l);
    /* Concatenate and print the String variables on a new line; 
        the 's' variable above should be printed first. */
    System.out.println(s+" "+m);

Some "Hidden Case #1" does not allow me to submit the code successfully. It's OK when I run it, but it something sort of changes the data when I submit... What am I doing wrong?

/* Solucion en Java 15 /

public static void main(String[] args) { int i = 4; double d = 4.0; String s = "HackerRank ";

    Scanner sc = new Scanner(System.in);
    int cz = sc.nextInt();
    double bz = sc.nextDouble();
    String si = sc.next();
    String sb = sc.nextLine();
    String result = s + si + sb;

    System.out.println(i + cz);
    System.out.println(d + bz);
    System.out.println(result);

    sc.close();


}

i = 4

d = 4.0

s = 'HackerRank '

x=int(input())

y=float(input())

z=str(input())

print(f"{x+i}\n{y+d}\n{s+z}")