#include <bits/stdc++.h>
using namespace std;
using ll=long long;
const ll mod=998244353;
#define rep(i,a) for (ll i=0;i<a;i++)

void solve();
// oddloop
int main() {
    int t=1;
    //cin>>t;
    rep(i,t) solve();
}

void solve(){
    string S;
	cin>>S;
	int J=1;
	rep(i,(int)(S.size())){
		if(S[i]=='('){
			J=0;
			cout<<"@";
		}
		if(J) cout<<S[i];
		if(S[i]==')') J=1;
	}
	cout<<"\n";
}