#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+1]==s[i])c++;
	    else{
	    	if(c>1){
	    		cout<<c;
	    	}
	    	cout<<s[i];
	    	c=1;
	    }
	}
    return 0;	
}
/**************************************************************
	Problem: 1103
	User: chenlingxuan
	Language: C++
	Result: Accepted
	Time:15 ms
	Memory:2076 kb
****************************************************************/