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




	return 0;
}



/**************************************************************
	Problem: 1103
	User: zhengzihao
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2076 kb
****************************************************************/