#include<bits/stdc++.h>
using namespace std;
int main(){
	 int m=1;
     string n;
     cin>>n;
     for(int i=0;i<=n.size();i++){
     	if(n[i]==n[i+1]) m++;
     	else{
     	if(m>1) cout<<m;
     	cout<<n[i];
     	m=1;
     	}
     	
     	
     }
     
    return 0;
}

/**************************************************************
	Problem: 1103
	User: duyahan
	Language: C++
	Result: Wrong Answer
****************************************************************/