#include<bits/stdc++.h>
using namespace std;
int main(){
	char c=0;
	int w=1;
	string s;
	cin>>s;
	for(int i=0;i<s.size();i++){
		if(s[i+1]!=s[i]){
			cout<<w<<s[i];
			w=1;
		}
		else if(s[i]==s[i+1]){
			w++;
		}
		else if(w==1){
			cout<<s[i];
		}
	}
	return 0;
}
/**************************************************************
	Problem: 1103
	User: houshanglin
	Language: C++
	Result: Wrong Answer
****************************************************************/