// Program 6.4 on page 109 of Brinch Hansen

class readability extends basic
{ public static void main (String param[]) throws Exception
  { 
  // establish keyboard and screen input and output
    input keyboard = new input();
    output screen = new output();
    screen.writeln("Type file name");
    
  // establish input and output text files
    input in = new input(keyboard.readword());
    output out = new output("results");
    
    in.readblanks();
    assume(in.more(), "empty text"); // "assume" checks that the file was
                                     // successfully opened and is nonempty
    int sentences = 0, words = 0;
  // Text: read a series of sentences until the file is empty   
    while(in.more())
      { String word = in.readname();
        in.readblanks();
        words = words + 1;
    // Sentence: read a sentence
        while ((in.next()!=':') && (in.next()!='?') && (in.next()!='.'))
      // AnotherWord: read the next word
          { if (in.next()==',')
              { in.readnext(); in.readblanks(); }
            word = in.readname();
            in.readblanks();
            words = words + 1;
          }
        in.readnext(); in.readblanks();
        sentences = sentences + 1;
      }
  // Compute average sentence length and display results
    int length = words / sentences;
    if (length <= 8) out.write ("4th grade");
    else if (length <= 11) out.write ("5th grade");
    else if (length <= 14) out.write ("6th grade");
    else if (length <= 17) out.write ("7th grade");
    else if (length <= 24) out.write ("High school");
    else out.write ("College");
    out.writeln (" level: " + length + " words per sentence");
    in.close(); out.close();
    keyboard.close(); screen.close();
  }
}