import java.io.*;
import java.util.*;
import java.lang.Character.UnicodeBlock;

/**
 * Count and display for the specified input file
 * the number of characters contained in various Unicode blocks .
 * @author Diomidis Spinellis
 */
class CharCount {
    public static void main(String args[]) {
	if (args.length != 2) {
	    System.err.println("Usage: CharCount file encoding");
	    System.exit(1);
	}

	// Open file; try-with-resources
	try (var in = new BufferedReader(new InputStreamReader(
                        new FileInputStream(args[0]), args[1]))) {

            // Count characters in blocks
            var count = new HashMap<Character.UnicodeBlock, Integer>();
	    int c;
	    while ((c = in.read()) != -1) {
		var u = Character.UnicodeBlock.of(c);
		    Integer oldN = count.get(u);
		    if (oldN == null)
			count.put(u, 1);
		    else
			count.put(u, oldN + 1);
	    }

            // Display results
            for (var s : count.entrySet())
                System.out.println(s.getKey() + ": " + s.getValue());
	} catch (FileNotFoundException e) {
	    System.err.println("Unable to open file " + args[0] + ": " + e.getMessage());
	    System.exit(1);
	} catch (UnsupportedEncodingException e) {
	    System.err.println("Unsupported encoding " + args[1] + ": " + e.getMessage());
	} catch (IOException e) {
	    System.err.println("Error reading character: " + e.getMessage());
	    System.exit(1);
	}

    }
}