import java util Scanner public class Main public static void main Str

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String line = sc.nextLine();
        int[] letters = new int[26];
        for (int i = 0; i < line.length(); i++) {
            if (line.charAt(i) == '.') {
                break;
            }
            if (line.charAt(i) >= 'a' && line.charAt(i) <= 'z') {
                letters[line.charAt(i) - 'a']++;
            }
        }
       
        for (int i = 0; i < letters.length; i++) {
            if(letters[i] != 0) {
                System.out.print((char)(i + 'a'));
            }
        }
        System.out.print(".");
    }
}