import com.sun.source.util.Trees;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.*;

public class asf {

    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        TreeSet<String> text = new TreeSet<>();

        String string = reader.readLine();


        for (char characterOfWord : string.toCharArray())
            text.add(characterOfWord + "");

        System.out.println();


        for (String charater : text) {
            System.out.println(charater + ":");

        }
    }
}