Help me in solving FIBXOR01 problem

help
,
1

My issue

iam getting error even though i feel my code is correct

My code

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

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){
	   int a=sc.nextInt();
	  int  b=sc.nextInt();
	   int n=sc.nextInt();
	    int res=n%3;
	    if(res==0){
	System.out.println(a);
	    }
	    else if(res==1){
	        System.out.println(b);
	    }
	    else{
	        System.out.println(a^b);
	        
	    }
	    t--;
	    
	}
	sc.close();
	}
}

Problem Link: Special Fibonacci Practice Coding Problem