Why my code gives me a Runtime error in 4071 problem in Live Archive?

Hello

I am stuck in this problem, I have tried many ways to find the error that gives me Runtime Error but I can not find it, I thought my code was O.K but not, any suggestions? The problem is 4071 - "Bubble Gum, Bubble Gum, in the dish, how many pieces do you wish?", and this is my code, I hope you can help me thanks

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

class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
        int t = Integer.parseInt(bf.readLine());
        String listNames = "";
        String nameChosen = "";
        int piecesGum = 0;

        for (int i = 0; i < t; i++) {
            listNames = bf.readLine();
            nameChosen = bf.readLine();
            piecesGum = Integer.parseInt(bf.readLine());
            solve(listNames, nameChosen, piecesGum);
        }
    }

    public static void solve(String listNames, String nameChosen, int piecesGum) {
        String[] names = listNames.split(" ");
        int pos = 0;
        for (int j = 0; j < names.length; j++) {
            if (names[j].equals(nameChosen)) {
                pos = j;
            }
        }
        //System.out.println(names[((n - 1) % names.length) + pos]);
        System.out.printf("%s%n",names[((piecesGum - 1) % names.length) + pos]);
    }
}