Что не так?
package com.javarush.task.task19.task1925;
import java.io.*;
/*
Длинные слова
*/
public class Solution {
public static void main(String[] args)throws Exception {
BufferedReader reader = new BufferedReader(new FileReader(args[0]));
BufferedWriter writer = new BufferedWriter(new FileWriter(args[1]));
String s = reader.readLine();
while(s != null){
String[] m = s.split(" ");
for (int i = 0; i < m.length; i++){
if(m[i].length() > 6){
writer.write(m[i]);
if (i != m.length-1){
writer.write(",");
}
}
}
s = reader.readLine();
}
reader.close();
writer.close();
}
}