#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define INF32 2147483647
#define ALL(x) x.begin(), x.end()
vector<int> ddx = {0, 1, 0, -1, 1, 1, -1, -1};
vector<int> ddy = {1, 0, -1, 0, 1, -1, -1, 1};


int main() {
  string t;cin>>t;
  int n = t.size();
  bool ok = true;
  rep(i,n){
    if(t.at(i) == '('){
      ok = false;
    }
    if(t.at(i) == ')'){
      ok = true;
      cout<< '@';
      continue;
    }
    if(ok)cout<< t.at(i);
  }
  cout<<endl;
  return 0;
}