#include <iostream>

int main() {
	std::string str = "1111P1P";
	
	std::string final;
	int running_total = 0;
	for(auto ch : str) {
		if(ch == '1') {	
			running_total++;
			continue;
		}
		if(running_total > 0) { final += std::to_string(running_total); }
		final += ch;
		running_total = 0;
	}
	
	// In case we ended on a '1'
	if(running_total > 0) { final += std::to_string(running_total); }
	
	std::cout << final;
	
	return 0;
}