#include <bits/stdc++.h>

int ri() {
	int n;
	scanf("%d", &n);
	return n;
}

int main() {
	std::string s;
	std::cin >> s;
	std::string res;
	int i = 0;
	for (; i < (int) s.size(); ) {
		if (s[i] != '(') res.push_back(s[i++]);
		else {
			while (s[i] != ')') i++;
			i++;
			res.push_back('@');
		}
	}
	std::cout << res << std::endl;
	return 0;
}