using System;

public class Program

{

    public static string Encrypt(string input)

    {

        int charCount =1;

        string output =string.Empty;

        for(int i=0;i<input.Length;i++)

        {

            string elem = input[i].ToString();

            if(i>0 && elem == input[i-1].ToString())

            {

                charCount++;

                if(i ==input.Length-1) output = output + charCount.ToString();

            }

            else if(i>0 && elem != input[i-1].ToString()){

                if(charCount>1)

                output = output + charCount.ToString() + elem;

                else output += elem;

                charCount=1;

            }

            if(i==0){

                output += elem;

            }

        }

        return output;

    }

    public static string Decrypt(string input)

    {

        string output =string.Empty;

        for(int i=0;i<input.Length;i++)

        {

            string elem = input[i].ToString();

            int charCount;

            int.TryParse(elem,out charCount);

            if(i>0 && charCount> 0)

            {

                for(int j=0;j<charCount-1;j++)

                {

                    output = output + input[i-1].ToString();

                }

            }

            else output = output +elem;

        }

        return output;

    }

    public static void Main()

    {

        string input = Console.ReadLine();

        string output = string.Empty;

​

        //output = Encrypt(input);

​

        output = Decrypt(input);

​

        Console.WriteLine(output);

    }

}