#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pll = pair<ll, ll>;
#define drep(i, cc, n) for (ll i = (cc); i <= (n); ++i)
#define rep(i, n) drep(i, 0, n - 1)
#define all(a) (a).begin(), (a).end()
#define pb push_back
#define fi first
#define se second

const ll MOD = 1000000007;
const ll MOD2 = 998244353;
const ll INF = 1LL << 60;
const ll MAX_N = 2e5;

int main(){
    string t;
    cin >> t;

    bool flag = false;
    rep(i, (ll)t.size()){
        if(!flag){
            if(t[i]=='('){
                cout << '@';
                flag = true;
            }else{
                cout << t[i];
            }
        }else{
            if(t[i]==')'){
                flag = false;
            }
        }
    }

    cout << endl;
}