#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
int main() {
    // Input
    string T;
    cin >> T;

    // Output
    bool between = false;
    rep(i, T.size()) {
        if (T[i] == '(') between = true;
        if (!between) cout << T[i];
        if (T[i] == ')') {
            cout << '@';
            between = false;
        }
    }
}