#include <iostream>
#include <string>
using namespace std;
using ll = long long;


int main() {
    string t; cin >> t;
    int n = t.size();
    int l = -1, r = -1;
    for (int i=0; i<n; i++) {
        if (t[i] == '(') l = i;
        if (t[i] == ')') r = i;
    }
    string ans;
    for (int i=0; i<n; i++) {
        if (i == l) ans.push_back('@');
        if (l <= i && i <= r) continue;
        ans.push_back(t[i]);
    }
    cout << ans << endl;
}