#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
  string S;
  cin>>S;
  int N = S.size();
  bool ok = true;
  for(int i=0;i<N;i++){
      if(S[i] == '(') ok = false;
      else if(S[i] == ')'){
          ok = true;
          cout<<'@';
      }
      else if(ok) cout<<S[i];
  }
  cout<<endl;
}