typedef long long ll;
typedef long double ld;
#include <bits/stdc++.h>
using namespace std;
#define int long long

signed main(){
    string t;
    std::cin >> t;
    bool ok = true;
    for (auto e : t) {
        if(e!='('&&ok){
            std::cout << e;
        }else if(ok&&e=='('){
            std::cout << '@';
            ok=false;
        }else if(!ok&&e!=')'){
            continue;
        }else if(!ok&&e==')'){
            ok=true;
        }else if(ok){
            std::cout << e;
        }
    }
    std::cout << std::endl;
}