#include<bits/stdc++.h>
using namespace std;
int main(){
   string s;
   int c;
   char x;
   cin>>s;
   c=1;
   x=s[0];
   for(int i=1;i<=s.sise()-1;i++){
   	   if(s[i]==x){
   	   	  c+1;
   	   }else{
   	   	     if(c>1) cout<<c;
   	   	     cout<<x;
   	   	     x=s[i];
   	   	     c=1'
   	   }
   }
   if(c>1) cout<<c;
   cout<<x;
	
}
/**************************************************************
	Problem: 1103
	User: chenyaohuo
	Language: C++
	Result: Compile Error
****************************************************************/