Multiple of three

help
1

I don’t know which test case it is failing to show wrong answer.
Here is my code

/* package codechef; // don't place package name! */

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

/* Name of the class has to be "Main" only if the class is public. */
class Codechef
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		Scanner sc = new Scanner(System.in);
		int t = sc.nextInt();
		while(t-->0){
		    long k = sc.nextLong();
		    long a = sc.nextInt();
		    long b = sc.nextInt();
		    ArrayList<Long> arr = new ArrayList<Long>();
		    arr.add(a);
		    arr.add(b);
	        if(k<2){
	            System.out.println("NO");
	            
		    }
		    else{
		    for(int i = 2;i<Long.toString(k).length();i++){
		    
		        long sum = 0;
		        for(int j = 0;j<i;j++){
		            sum = sum + arr.get(j);
		        }
		        arr.add(sum%10);
		        
		    }   
		    long res = 0;
		    for(int i = 0;i<arr.size();i++){
		        res = res + arr.get(i);
		    }
		    if(res%3==0){
		        System.out.println("YES");
		    }
		    else{
		        System.out.println("NO");
		    }
		    }
		}
	}
}