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

/**************************************************************
	Problem: 1103
	User: linyuhang
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2076 kb
****************************************************************/