#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 4000000000000000001

int main() {	
	
	string t;
	cin>>t;
	
	string s = "";
	bool f = true;
	rep(i,t.size()){
		if(t[i]=='('){
			f = false;
			continue;
		}
		if(t[i]==')'){
			f = true;
			s += '@';
			continue;
		}
		if(f)s += t[i];
		
	}
	cout<<s<<endl;
	
    return 0;
}