Help me in solving LPYAS151 problem

help
,
1

My issue

class Codechef
{
public static void main (String args) throws java.lang.Exception
{
int n,sum=0,digit,num;
Scanner sc =new Scanner(System.in);
n=sc.nextInt();
while(n>0)
{
num=n;
digit=n%10;
int r=digitdigitdigit;
sum=sum+r;
n=n/10;
if(sum==num)
{
System.out.println(“Armstrong”);
}
else{
System.out.println(“Not Armstrong”);
}
}

}

}

My code

import java.util.*;
import java.lang.*;
import java.io.*;

class Codechef
{
	public static void main (String[] args) throws java.lang.Exception
	{
		int n,sum=0,digit,num;
		Scanner sc =new Scanner(System.in);
		n=sc.nextInt();
		while(n>0)
		{
		    num=n;
		    digit=n%10;
		    int r=digit*digit*digit;
		    sum=sum+r;
		    n=n/10;
		    if(sum==num)
		    {
		        System.out.println("Armstrong");
		    }
		    else{
		        System.out.println("Not Armstrong");
		    }
		}
		
		
		

	}
}

Learning course: Roadmap to 3*
Problem Link: https://www.codechef.com/learn/course/klu-roadmap-3star/KLURMP300B/problems/LPYAS151