#include <bits/stdc++.h>
using namespace std;
using ch = char;
using ll = long long;
using ld = long double;
using db = double;
using st = string;
using vdb = vector<db>;
using vvdb = vector<vdb>;
using vl = vector<ll>;
using vvl = vector<vl>;
using vvvl = vector<vvl>;
using vd = vector<ld>;
using vvd = vector<vd>;
using vs = vector<st>;
using vvs = vector<vs>;
using vc = vector<ch>;
using vvc = vector<vc>;
using vb = vector<bool>;
using vvb = vector<vb>;
using vvvb = vector<vvb>;
const ll mod = 998244353;
const ll MOD = 1000000007;
using vp = vector<pair<ll,ll>>;
#define fi first
#define se second

int main(){
  st S,T;
  cin>>S;
  bool f=false;
  for(int i=0; i<S.size(); i++){
    if(S.at(i)=='('){
      f=true;
      T+='@';
    }
    if(!f)
      T+=S.at(i);
    if(S.at(i)==')')
      f=false;
  }
  cout<<T<<endl;
}