//Deleting a character

using System;

​

public class Program

{

    private static string lexistring(string S, int k)

    {

        string lexianswer = "";

        int originallength = S.Length;

        foreach (char i in S.ToCharArray())

        {

            while (lexianswer.Length > 0 && lexianswer[lexianswer.Length - 1] > i && k > 0)

            {

                lexianswer = lexianswer.Substring(0, lexianswer.Length - 1);

                k--;

            }

            lexianswer += i;

        }

        //while (lexistring.Length > 0 && k-- > 0)

        if(lexianswer.Length==originallength)

        {

            lexianswer = lexianswer.Substring(0, lexianswer.Length - 1);

        }       

        return lexianswer;

    }

    public static void Main(String[] args)

    {

        string name = Console.ReadLine();

        Console.WriteLine(lexistring(name,1));

    }

}