#include <iostream>
#include <algorithm>

std::string interleave(const std::string &s1, const std::string &s2) {
	int length = std::min(s1.length(), s2.length());
	std::string result;
	for (int i = 0; i < length; i++) {
		result += s1[i];
		result += s2[i];
	}
	return result;
}

int main() {
	std::cout << interleave("aaaaaa", "drzewko") << std::endl;
	return 0;
}