package no3010;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) throws Exception {
		Process pr = Runtime.getRuntime().exec("ls /bin -F");
		Scanner sc = new Scanner(pr.getInputStream());
		ArrayList<String> lis = new ArrayList<>();
		int count = 0;
		while(sc.hasNext()) {
			count++;
			String s = sc.next();
			if (s.startsWith(".") || s.endsWith("/")) {
				continue;
			}
			lis.add(s);
		}
		if (count < 2) {
			throw new RuntimeException();
		}
		Collections.sort(lis);
		for(String s: lis) {
			System.out.println(s);
		}
	}

}