#include <iostream>
#include <string>
#include <vector>
#include <sstream>

int main()
{
	std::vector<std::string> compressed;
	std::string input;
	int counter = 1;

	std::cin >> input;

	for (int element = 0; element < input.size(); element++)
	{
		std::string formattedInput;
		if (input[element] == input[element + 1] && input[element + 1] != input.size()+1)
		{
			counter++;
		}
		else if (input[element] != input[element + 1] && counter == 1)
		{
			formattedInput += input[element];
			compressed.push_back(formattedInput);
			counter = 1;
		}
		else if (input[element] != input[element + 1] && counter == 2)
		{
			formattedInput += input[element];
			formattedInput += input[element];
			compressed.push_back(formattedInput);
			counter = 1;
		}
		else if (input[element] != input[element + 1] && counter > 2)
		{
			std::stringstream ss;
			ss << counter;
			formattedInput += ss.str();
			formattedInput += input[element];
			compressed.push_back(formattedInput);
			counter = 1;
		}
	}

	for (auto i : compressed)
	{
		std::cout << i;
	}
	std::cout << std::endl;

	return 0;
}