#include <bits/stdc++.h>
using namespace std;
int main()
{
	string str;
	cin >> str;
	int sum = 1;
	for (int i = 0; i < (int)str.length(); i++)
	{
		if (str[i] == str[i + 1]) sum++;
		else
		{
			cout << str[i] << sum;
			sum = 1;
		}
	}
	return 0;
}