import java.io.*;

  /*
   * If you are interested...
   *
   * This class is an example of a Java class to read and process
   * input from the keyboard. It does absolutely no error handling
   * and blatently defeats Java's error handling -- so don't feed it
   * badly.
   *
   * Please also feel free to modify it or to discard it.
   */
  class Keyboard
  {
    private BufferedReader keyb;

    /*
     * This is the constructor for the keyboard class, it initializes
     * the keyboard buffer
     */
    public Keyboard()
    {
      try
      {
        keyb = new BufferedReader (new InputStreamReader(System.in));
      }
      catch (Exception e) {};
    }


    /*
     * This function reads a floating point number from the keyboard
     * WARNING: It does no error detection or management
     */
    public float getFloat() 
    {
      try
      {
        return Float.valueOf(keyb.readLine()).floatValue();
      }
      catch (Exception e) {}; return -1; /* This is _really_ bad */
    }


    /*
     * This function reads a string from the keyboard
     * WARNING: It does no error detection or management
     */
    public String getString()
    {
      try
      {
        return keyb.readLine();
      }
      catch (Exception e) {}; return ""; /* This is _really_ bad */
    }


    /*
     * This function reads an int from the keyboard
     * WARNING: It does no error detection or management
     */
    public int getInt()
    {
      try
      {
        return Integer.parseInt(keyb.readLine());
      }
      catch (Exception e) {}; return -1; /* This is _really_ bad */
    }
  }