48 Exception size string n (7>n>18)

import java.util.*;
public class Main
{
    public static void main(String[] args) {
        Scanner fn = new Scanner(System.in);
        System.out.println("Enter a string ");
        String s = fn.nextLine();

        int n = s.length();

        try{
            if(n<7 || n>18){
                throw new StringIndexOutOfBoundsException("Lenth of String is not expected");
            }
            else {
                System.out.println("Your input is fine");
            }
        }
        catch(StringIndexOutOfBoundsException e){
            System.out.println(e);
        }
        finally{
            System.out.println("This is from finally block");
        }
    }
}

/*
Enter a string
suresh
java.lang.StringIndexOutOfBoundsException: Lenth of String is not expected
This is from finally block
*/