#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; }