#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
typedef long long ll;
using namespace std;

int main() {
    cin.tie(0)->sync_with_stdio(0);

    string S;
    cin >> S;
    int N = S.size();

    bool flag = false;
    rep(i, N) {
        if (flag && S[i] == ')') {
            flag = false;
        } else if (S[i] == '(') {
            flag = true;
            cout << "@";
        } else if (!flag)
            cout << S[i];
    }
    cout << "\n";

    return 0;
}