/*＿＿＿＿＿＿
　　 ||　　　　  　|
　　 ||ACはこちらへ|
　　 ||　　　　  　|
　　 ||￣￣￣￣￣￣ 
∧_∧||
(`･ω･||
（ つ||０
　uｰu*/
#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (ll i = 0; i < n; ++ i)
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).begin(),(x).end()
using ll = long long ;
using P = pair<ll,ll>;
using PP = pair<ll,P>;
using vi = vector<ll>;
using vb = vector<bool>;
using vs = vector<string>;
using vp = vector<P>;
using vvi = vector<vi>;
using vvvi = vector<vvi>;
const ll INF = 1e17;
const int inf = 1001001001;
const int dx[4]={1,-1,0,0};
const int dy[4]={0,0,1,-1};
const ll mod=998244353;


int main(){
    string s;
	cin >> s;
	int n = s.size();
    string t = "";
    bool k = true;
    rep(i,n){
        if(s[i]=='(') k = false;
        if(s[i] ==')') {k = true; t+='@';}
        else if(k) t +=s[i];
    }
    cout<<t<<endl;
}