#include<bits/stdc++.h>
using namespace std;
int main(){
	string s;
	int c=1;
	cin>>s;
	for(int i=0;i<s.size();i++){
		if(s[i]==s[1+i]){
			c++;
		}else{
			if(c==1) cout<<s[i];
			else {
				cout<<c<<s[i];
				c=1;}
		}
	}
	return 0;
}
/**************************************************************
	Problem: 1103
	User: panyuchen
	Language: C++
	Result: Accepted
	Time:22 ms
	Memory:2076 kb
****************************************************************/