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

/**************************************************************
	Problem: 1103
	User: zhangailin
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2076 kb
****************************************************************/