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

public class SentenceSplitter {
    public static final String DICTIONARY_FILE = "dictionary.txt";

    public static String splitSentence(String sentence, Set<String> dictionary) {
        if (dictionary.contains(sentence)) {
            return sentence;
        } 
        else {
            for (int i = 1; i < sentence.length(); i++) {
                // splitting...
                String left = sentence.substring(0, i);
                String right = sentence.substring(i);
                if (dictionary.contains(right)) {
                    // ... recurse
                    String result = splitSentence(left, dictionary);
                    if (result != null) {
                        return result + " " + right;
                    }
                }
                // undo
                sentence = left + right;
            }
        }

        return null;
    }

    /*
     * 
     * Choices? t hisisasentence th isisasentence thi sisasentence ...
     */

    public static void main(String[] args) throws FileNotFoundException {
        Scanner scan = new Scanner(System.in);
        String toSplit = "";

        while (!toSplit.equals("q")) {
            System.out.print("Query: ");
            toSplit = scan.nextLine();
            System.out.println("Splitting: " + toSplit);

            System.out.println("Did you mean: "
                    + splitSentence(toSplit, readDictionary()));
        }
        scan.close();
    }

    private static Set<String> readDictionary() throws FileNotFoundException {
        Scanner input = new Scanner(new File(DICTIONARY_FILE));
        Set<String> words = new HashSet<String>();
        while (input.hasNext()) {
            words.add(input.next());
        }
        input.close();
        return words;
    }
}