import java.util.Arrays;
import java.util.Comparator;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String s = scanner.nextLine();
        String[] split = s.split(",");
        Integer[] arr = Arrays.stream(split).mapToInt(Integer::parseInt).boxed().toArray(Integer[]::new);
        solution(arr);
    }

    private static void solution(Integer[] arr) {
        Arrays.sort(arr, Comparator.comparingInt(o -> (Math.abs(o) % 10)));
        String[] strings = Arrays.stream(arr).map(Object::toString).toArray(String[]::new);
        System.out.println(String.join(",",strings));
    }
}