#include <fstream>
#include <iostream>
#include <string>
#include <cstdlib>

int main() {

	//std::ifstream inf("Text.txt");	std::cin.rdbuf(inf.rdbuf());

	std::string str;
	std::cin >> str;

	std::cout << std::abs(static_cast<int>(str.length()) - 10) << std::endl;

	return 0;
}