Что не так?

package com.javarush.task.task19.task1906;

/*
Четные символы
*/

import java.io.*;

public class Solution {
    public static void main(String[] args) throws IOException {
        BufferedReader rd = new BufferedReader(new InputStreamReader(System.in));
        String nameIn = rd.readLine();
        String nameOut = rd.readLine();
        rd.close();

        BufferedReader reader = new BufferedReader(new FileReader(nameIn));
        String line;
        StringBuilder sb = new StringBuilder();
        while ((line = reader.readLine()) != null) {
            sb.append(line);
        }
        reader.close();

        char[] charArray = sb.toString().toCharArray();
        String result = "";
        for(int i = 0; i < charArray.length; i++) {
            if (((i + 1) % 2) == 0) {
                result += charArray[i];
            }
        }

        BufferedWriter writer = new BufferedWriter(new FileWriter(nameOut));
        writer.write(result);
        writer.close();
    }
}