#![allow(non_snake_case, unused_must_use, unused_imports)]
use std::io::{self, prelude::*};

fn main() {
    let (stdin, stdout) = (io::read_to_string(io::stdin()).unwrap(), io::stdout());
    let (mut stdin, mut buffer) = (stdin.split_whitespace(), io::BufWriter::new(stdout.lock()));

    macro_rules! input {
        ($t: tt, $n: expr) => {
            (0..$n).map(|_| input!($t)).collect::<Vec<_>>()
        };
        (Chars) => {
            input! {String}.chars().collect::<Vec<_>>()
        };
        (Usize1) => {
            stdin.next().unwrap().parse::<usize>().unwrap() - 1
        };
        ($t: ty) => {
            stdin.next().unwrap().parse::<$t>().unwrap()
        };
    }

    let T = input!(Chars);

    let mut ans = vec![];

    let mut seen = false;
    for s in T {
        if s == '(' {
            seen = true;
        } else if s == ')' {
            seen = false;
            ans.push('@');
        } else if !seen {
            ans.push(s);
        }
    }

    writeln!(
        buffer,
        "{}",
        ans.into_iter()
            .map(|x| x.to_string())
            .collect::<Vec<_>>()
            .join("")
    );
}