The program will not compile as you cannot use a numeric value as the file title as you also cannot use it as a class name. Also no comments." Please help me fix it thank you.

 

import java.util.Scanner;

public class Exercise_04_22 {

public static void main(String[] args) {

Scanner in = new Scanner(System.in);

System.out.print("Enter string s1: ");

String s1 = in.nextLine();

System.out.print("Enter string s2: ");

String s2 = in.nextLine();

if (s1.indexOf(s2) != -1) {

System.out.printf("%s is a substring of %s%n", s2, s1);

} else {

System.out.printf("%s is not a substring of %s%n", s2, s1);

}

}

}