#include <bits/stdc++.h>
using namespace std;
int main () {
    string s;
    cin >> s;
    bool co = true;;
    for (char c : s) {
        if (c == '(') {
            co = false;
        } else if (c == ')') {
            co = true;
            cout << "@";
        } else if (co) {
            cout << c;
        }
    }
    cout << endl;
}