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

/**************************************************************
	Problem: 1103
	User: zzz
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2076 kb
****************************************************************/