#include<bits/stdc++.h>
using namespace std;
int main()
{
    string s;
    int c = 0;
    cin >> s;
    for( int i = 0; i < s.size();i++)
    {
    	if(s[i] == s[i + 1])
    	{
    		c++;
    	}
    	else
    	{
    		if(c > 0)
    		{
    			cout << c+1;
    		}
    		cout << s[i];
    		c = 0;
    	}
    }
	return 0;
} 
/**************************************************************
	Problem: 1103
	User: linyuhang
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2076 kb
****************************************************************/