import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.StringTokenizer;
import java.util.Vector;

public class Play
{
  private final static String DELIMITERS = " .?!()[]{}|/&\\,;:-\'\"\t\n\r";

  private Vector<String> text;

  public Play( String filename )
  {
    text = new Vector<String>();
    try {
      BufferedReader inputFile = new BufferedReader( new FileReader(filename) );
      String line = inputFile.readLine();
      while ( line != null )
      {
        text.addElement( line );
        line = inputFile.readLine();
      }
    } catch ( IOException e ) {
      System.err.println( "Error opening reader on file: " + filename );
    }
  }
  
  public int startsWith( char targetChar )
  {
    targetChar = Character.toLowerCase( targetChar );
    
    int wordCount = 0;
    String buffer;
    StringTokenizer words;
    String word;

    for ( int i = 0; i < text.size(); i++ )
    {
      buffer = text.elementAt(i).toLowerCase();
      words = new StringTokenizer( buffer, DELIMITERS );
      while( words.hasMoreElements() )
      {
        word = (String) words.nextElement();
        if ( word.charAt( 0 ) == targetChar )
          wordCount++;
      }
    }
    
    return wordCount;
  }
  
  public int wordsOfLength( int targetLength )
  {
    int wordCount = 0;
    String buffer;
    StringTokenizer words;
    String word;

    for ( int i = 0; i < text.size(); i++ )
    {
      buffer = text.elementAt(i).toLowerCase();
      words = new StringTokenizer( buffer, DELIMITERS );
      while( words.hasMoreElements() )
      {
        word = (String) words.nextElement();
        if ( word.length() == targetLength )
          wordCount++;
      }
    }
    
    return wordCount;
  }
  
  public int numberOfPalindromes()
  {
    int wordCount = 0;
    String buffer;
    StringTokenizer words;
    String word;

    for ( int i = 0; i < text.size(); i++ )
    {
      buffer = text.elementAt(i).toLowerCase();
      words = new StringTokenizer( buffer, DELIMITERS );
      while( words.hasMoreElements() )
      {
        word = (String) words.nextElement();
        if ( isAPalindrome(word) )
          wordCount++;
      }
    }
    
    return wordCount;
  }
  
  private boolean isAPalindrome( String s )
  {
    if ( s == null)
      return false;

    int length = s.length();
    if ( length < 2 )
      return true;

    int half = length/2;
    for ( int i = 0; i < half; ++i )
      if ( s.charAt(i) != s.charAt(length - 1 - i) )
        return false;
    
    return true;
  }
}