#include<bits/stdc++.h>
using namespace std;
int main()
{
	char a[256],i;
	int b=0;
	gets(a);
	for(i=0;i<strlen(a);i++){
		b++;
		if(a[i]!=a[i+1]){
			if(b==1){
				cout<<a[i];
				b=0;
			}
			else{
				cout<<b<<a[i];
			b=0;
			}
		}
	}	
	return 0;
}
/**************************************************************
	Problem: 1103
	User: houshanglin
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2076 kb
****************************************************************/