import java.util.regex.*;
import java.io.*;
import java.util.*;

public class DirList {
    public static void main(String[] args) {
        File path = new File(".");
        String[] list;
        if (args.length == 0)
            list = path.list();
        else
            list = path.list(new DirFilter(args[0]));
        Arrays.sort(list, String.CASE_INSENSITIVE_ORDER);
        for (String dirItem : list)
            System.out.println(dirItem);
    }
}

class DirFilter implements FilenameFilter {
    private Pattern pattern;

    public DirFilter(String regex) {
        pattern = Pattern.compile(regex);
    }

    public boolean accept(File dir, String name) {
        return pattern.matcher(name).matches();
    }
}