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

	return 0;
}

/**************************************************************
	Problem: 1103
	User: zhuanghaoxiang
	Language: C++
	Result: Wrong Answer
****************************************************************/