#include <iostream>
#include <vector>
#include <map>
#include <queue>
#include <algorithm>
#include <set>
#include <cmath>
#include <bitset>
using namespace std;

int main() {
    string s;cin>>s;
    int n = (int)s.size();
    
    bool start = false;
    string t="";
    for(int i=0;i<n;i++){
        if(s[i]=='(') start=true;
        if(s[i]==')'){
            t.push_back('@');
            start =false;
            continue;
        }
        if(start) {
            continue;
        }else{
            t.push_back(s[i]);
        }
    }
    
    cout << t << endl;
    
}