// CSci 4509 Computing letter frequencies
// Elena Machkasova, 1/26/05

import java.io.*;

public class LetterFrequency {
    public static void main(String[] args) throws IOException  {
	int [] letters = new int[26];
	int total = 0;

	// check if the file name has been supplied
	if (args.length < 1) {
	    System.out.println("You need to specify the file name");
	}

	// open the file
	FileReader in = new FileReader(new File(args[0]));
	
	int next;

	while ((next = in.read()) != -1) {
	    char c =(char) next;
	    if (Character.isUpperCase(c)) {
		letters[c - 'A']++;
		total++;
	    } else if (Character.isLowerCase(c)) {
		letters[c - 'a']++;
		total++;
	    }
	}

	for (int i = 0; i < 26; ++i) {
	    char c = (char) ('A' + i);
	    System.out.print(c + " " + letters[i] + "\t");
	    // C style formatting. Avaliable in Java 5.0. 
	    // Most innovations are well-forgotten old things :-)
	    System.out.printf("%5.3f\n", ((double) letters[i])/total);
	}

	in.close();
    }

}