where is mistake?
package pl.codegym.task.task19.task1925;
/*
Long words
*/
import java.io.*;
public class Solution {
public static void main(String[] args) throws IOException {
String file1 = args[0];
String file2 = args[1];
BufferedReader reader = new BufferedReader(new FileReader(file1));
FileWriter fileWriter = new FileWriter(file2);
while(reader.ready()){
String a = reader.readLine();
String s="";
StringBuilder sB = new StringBuilder();
if(a.length() > 6){
sB.append(a + ",");
}
s = sB.toString();
String x = s.substring(0, s.length() - 1);
fileWriter.write(x);
System.out.println(x);
}
reader.close();
fileWriter.close();
}
}