#include<bits/stdc++.h>
using namespace std;
string s;
int c=1;
int main(){
	cin>>s;
	for(int i=0;i<s.size();i++){
		if(s[i]==s[i+1]) c++;
		else{
			if(c==1) cout<<s[i];
			else{
				cout<<c<<s[i];
				c=1;
			}
		}
		
	}
	return 0;
}
/**************************************************************
	Problem: 1103
	User: hongjiaming
	Language: C++
	Result: Accepted
	Time:16 ms
	Memory:2076 kb
****************************************************************/