I failed. I tried much but I can not do it as I don't know how to call somtehing in main method and .. please show me how to do it. I can not find any similar example in the material. There was a similar task before this one that I failed it as well. Thanks this is my solution: package com.codegym.task.task01.task0127; /* Square of a number */ public class Solution { public static void main(String[] args) { //write your code here int a = 5; System.out.print(a*a); } public static int sqr(int a) { return a * a; } }