#include<cstdio>
#include<iostream>
using namespace std;

int main(){
	
	string s;
	cin>>s;
	int len=s.length();
	char now=s[0];
	int count=1;
	
	for(int i=1;i<len;++i){
		if(s[i]==s[i-1]){
			count++;
		}
		else{
			cout<<now<<count;
			count=1;
			now=s[i];
		}
	}
	
	cout<<now<<count;

	return 0;
}