#include <bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
#define pll pair<ll,ll>
#define vi vector<int>
#define vl vector<ll>
#define mp make_pair
#define pb push_back
#define se second
#define fi first
using namespace std;
ll set_on(int n, int k){
	return (n |= 1 << k);
}
ll set_off(int n, int k){
	return (n &= ~(1UL << k));
}
bool check_bit(int n, int k){
	int bit = (n >> k) & 1U;
	if(bit == 1)
		return true;
	return false;
}
void solve(){
	string str;
	cin>>str;
	int flag = 0;
	for(int i = 0; i < (int)str.size(); i++){
		if(str[i] == '(')
			flag = 1;
		else if(str[i] ==')' && flag == 1){
			cout<<'@';
			flag = 0;
		}
		else if(flag == 0)
			cout<<str[i];
		else
			continue;
	}
}
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	cout.precision(10);
	cout<<fixed;
	int t=1;
//	cin>>t;
	while(t--)
		solve();

	return 0;
}