#define _USE_MATH_DEFINES
#include<iostream>
#include<vector>
#include<algorithm>
#include<cmath>
#include<string>
#include<iomanip>
#include<numeric>
#include<queue>
#include<deque>
#include<stack>
#include<set>
#include<map>
#include<random>
#include<bitset>
#include<cassert>
#include<complex>
#include<fstream>
#include<cstdlib>
#include<functional>
using namespace std;
typedef long long ll;
const int mod=998244353;
const int dx[]={1,0,0,-1},dy[]={0,1,-1,0};
int main(){
	string t;
	cin>>t;
	bool f=1;
	for(auto x:t){
		if(x=='(')
			f=0;
		if(f)
			cout<<x;
		if(x==')'){
			f=1;
			cout<<'@';
		}
	}
	cout<<endl;
}