#include <iostream>
#include <ostream>
#include <regex>
#include <string>
using namespace std;

int main() {
	const regex pattern("([\\w ])(?!\\1)");
	string s = "ssha3akjssss42jj 234444 203488842882387 heeelloooo";
	string result;

	for (sregex_iterator i(s.begin(), s.end(), pattern), end; i != end; ++i)
		result.append((*i)[0].str());

	cout << result << endl;
	
	return 0;
}