use proconio::input;
fn main(){
    input!{
        s:String,
    }
    let a=s.chars().count();
    let mut ans=0;
    for i in (0..a){
        let c=&s[i..i+1];
        if "0"<=c && c<="9"{
            let c:usize=c.parse().unwrap();ans+=c;
        }
    }
    print!("{}",ans);
}