using System;

public class Program

{

    public static void Main()

    {

        String s1 = Console.ReadLine();

        Console.WriteLine(NameType(s1));

    }

    public static string NameType(string s1)

    {

        NameType(s1,0);

        if (NameType(s1,0) == "")

            return "0";

        return NameType(s1,0);

    }

    public static string NameType(string s1, int i)

    {

        if(i == s1.Length )

            return "";

        if(s1[i] >= 48 && s1[i] <= 57)

            return s1[i] +  NameType(s1, i +1);

        return NameType(s1, i +1);

    }

​

}