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


	return 0;
}

/**************************************************************
	Problem: 1105
	User: caijiajie
	Language: C++
	Result: Wrong Answer
****************************************************************/