/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String prev = "11";
		StringBuilder res = new StringBuilder();
        int count = 1;
        for(int i=0;i<prev.length();){
            int j= i+1;
            while(j<prev.length() && prev.charAt(i)==prev.charAt(j)){
                j++;
                count++;
            }
            res.append(count + "" + prev.charAt(i));
            i=j;
        }
 
        System.out.println(res.toString());
	}
}

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