Странно, почему не принимается решение?

package com.javarush.task.task19.task1923; /* Слова с цифрами */ import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import java.util.ArrayList; public class Solution { public static void main(String[] args) throws IOException { FileReader fileReader = new FileReader(args[0]); ArrayList<Character> charsList = new ArrayList<>(); char[] chars = new char[200]; while (fileReader.ready()) { fileReader.read(chars); for (char c : chars) { if(c != '\r' && c != '\u0000') charsList.add(c); } chars = new char[200]; } fileReader.close(); // for (char c : charsList) System.out.print(c); StringBuilder strBuild = new StringBuilder(); for (char c : charsList) { if(c == '\n') strBuild.append(" "); else if(Character.isLetterOrDigit(c) || Character.isSpaceChar(c)) strBuild.append(c); } String result = strBuild.toString(); // System.out.println("result: " + result); String[] strings = result.split(" "); ArrayList<String> words = new ArrayList<>(); for (String s : strings) { boolean let = false;//кроме цифры в слове должна быть хотябы одна буква boolean dig = false;//наличие в слове цифры for (int i = 0; i < s.length(); i++) { if(Character.isDigit(s.charAt(i))) dig = true; if(Character.isLetter(s.charAt(i))) let = true; } if (let && dig) { words.add(s); } } strBuild = new StringBuilder(); for (int i = 0; i < words.size(); i++) { if(i != words.size()-1) strBuild.append(words.get(i)).append(" "); else strBuild.append(words.get(i)); } // System.out.println("strBuild.toString: " + strBuild.toString()); result = strBuild.toString(); FileWriter fileWriter = new FileWriter(args[1]); fileWriter.write(result); fileWriter.close(); } }