import java.io.*;
import java.util.*; //HashMap

public class WordFrequency {

	public static void main(String args[]) {

		if (args.length != 1) {
			System.err.println("Usage: java WordFrequency <filename>");
			System.exit(1);
		}
    
		Map words = new HashMap(); 	//An object that maps keys to values. 
		//A map cannot contain duplicate keys; each key can map to at most one value.
		
		String delim = " \t\n.,:;?!-/()[]\"\'+=%$£#@\\";

		try { 	//FileReader: java.io.FileNotFoundException
			BufferedReader in = new BufferedReader( new FileReader(args[0]) );

			String line, word;
			Count count;

			try {
				while ((line = in.readLine()) != null) { // readLine(): IOException - If an I/O error occurs
					StringTokenizer st = new StringTokenizer(line, delim);
					while (st.hasMoreTokens()) {
						word = st.nextToken().toLowerCase(); //nextToken: java.util.NoSuchElementException
						count = (Count) words.get(word);
						if (count == null) {
							words.put(word, new Count(word, 1));
						} else {
							count.i++;
						}
					}
				}
			} catch (Exception e) {
				System.err.println(e);
			}

			Set set = words.entrySet(); 	// A collection that contains no duplicate elements.
			Iterator iter = set.iterator();
			Map maxWords = new HashMap(); 	// max arv sõnu võib olla mitu..
			Count maxCount = new Count("", 0);
			while (iter.hasNext()) {
				Map.Entry entry = (Map.Entry) iter.next();  //key-value pair
				word = (String) entry.getKey();
				count = (Count) entry.getValue();
				if (maxCount.i <= count.i) {
					if (maxCount.i < count.i) {
						maxWords = new HashMap();
						maxWords.put(word, (maxCount = count));
					} else if (maxCount.i == count.i)
						maxWords.put(word, count);
				}
				System.out.println(word + (word.length() < 8 ? "\t\t" : "\t") + count.i);
			}

			if (maxWords.size() > 1) {
				System.out.println("\nKõige sagedamini (" + maxCount.i + ") esinesid järgmised sõnad:");
				Iterator maxIter = maxWords.keySet().iterator();
				while (maxIter.hasNext()) {
					System.out.println((String)maxIter.next());
				}
			} else if (maxWords.size() == 1)
				System.out.println("\nKõige sagedamini (" + maxCount.i + ") esines sõna: " + maxCount.word); 
			else
				System.out.println("\nFailist \"" + args[0] + "\" ei leitud ühtegi sõna.");

		} catch (IOException e) {
			System.out.println(e.getMessage());
		}

	}
}