use proconio::input;
use proconio::marker::Chars;

fn main() {
    input! {t:Chars}
    let mut locked = false;
    for i in 0..t.len() {
        if t[i] == '(' {
            locked = true;
        }
        if !locked {
            print!("{}", t[i])
        };
        if t[i] == ')' {
            locked = false;
            print!("@")
        }
    }
    println!();
}