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

public class ex1 {

  static boolean isValidWord (String str)
  {
    for (int i=0; i < str.length(); i++)
      if (! (Character.isLetter(str.charAt(i))) )
        return false;
    return true;
  }
  

  static String[] getDictionary (String fullPathName)
  {
    try {
      File f = new File (fullPathName);
      LineNumberReader lnr = new LineNumberReader (new FileReader (f));
      String line = lnr.readLine();
      int count = 0;
      while (line != null) {
        String str = line.trim().toLowerCase();
        if (isValidWord (str))
          count++;
        line = lnr.readLine();
      }
      lnr.close();
        
      System.out.println ("Number of words: " + count);
      // OK, now make the space.
      String[] strArray = new String [count];
      lnr = new LineNumberReader (new FileReader (f));
      count = 0;
      line = lnr.readLine();
      while (line != null) {
        String str = line.trim().toLowerCase();
        if (isValidWord (str)) {
          strArray [count] = line.trim().toLowerCase();
          count++;
        }
        line = lnr.readLine();
      }
      lnr.close();
      return strArray;
    }
    catch (IOException e) {
      e.printStackTrace();
      return null;
    }
  }
  
  public static void main (String[] argv) 
  {
    String[] words = getDictionary ("words");

    // INSERT YOUR CODE HERE
  }
  
}