fn main() {
    let s: String = read();
    let sum = s.chars()
        .filter(|c|c.is_digit(10))
        .map(|c|format!("{}", c).parse::<i32>().ok().unwrap())
        .fold(0,|s,n|s+n);
    println!("{}", sum);
}

fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}