#include <iostream>
using namespace std;
int main(){
    string s;cin>>s;
    for(int i = 0; s.size() > i; i++){
        if(s[i] == '('){
            while(s[i] != ')')i++;
            cout << "@";
        }else{
            cout << s[i];
        }
    }
    cout << endl;
}