#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]==s[i+1]) c++;
		 else{
		 	if(c>1) cout<<c;
		 	cout<<s[i];
		 	c=1;
		 }
	}
	
	return 0;
}

/**************************************************************
	Problem: 1103
	User: linzihang
	Language: C++
	Result: Accepted
	Time:13 ms
	Memory:2076 kb
****************************************************************/