use std::io::*;
//use std::num;
use std::str::FromStr;
use std::time::Instant;

fn main() {
    let n = read_array();
    let mut count = 0;

    for _i in 0..n.len(){
        if n[_i] == '0' || n[_i] == '1' || n[_i] == '2' || n[_i] == '3' || n[_i] == '4' || n[_i] == '5' || n[_i] == '6' || n[_i] == '7' || n[_i] == '8' || n[_i] == '9'{
            count += n[_i] as usize - 48;
        }
    }
    
    println!("{}",count);

    //println!("[DEBUG_PRINT] {} ms", now.elapsed().as_millis());
}
pub fn min(x: usize, y: usize) -> usize {
    let z: usize;

    if x <= y {
        z = x;
    } else {
        z = y;
    }

    return z;
}

pub fn read<T: FromStr>() -> T {
    let stdin = stdin();
    let stdin = stdin.lock();
    let token: String = stdin
        .bytes()
        .map(|c| c.expect("failed to read char") as char)
        .skip_while(|c| c.is_whitespace())
        .take_while(|c| !c.is_whitespace())
        .collect();
    token.parse().ok().expect("failed to parse token")
}

pub fn read_array() -> Vec<char> {
    let array: String = read();
    let chars: Vec<char> = array.trim().chars().collect::<Vec<char>>();
    chars
}

pub fn get_data() -> Vec<u64> {
    let mut s: String = String::new();
    std::io::stdin().read_line(&mut s).ok();
    let vec: Vec<u64> = s
        .trim()
        .split_whitespace()
        .map(|e| e.parse().ok().unwrap())
        .collect();

    vec
}

pub fn get_chars() -> Vec<char> {
    let mut s: String = String::new();
    std::io::stdin().read_line(&mut s).ok();

    let vec: Vec<char> = s.trim().chars().collect::<Vec<char>>();

    vec
}

pub fn read_line() -> String {
    let mut s: String = String::new();
    std::io::stdin().read_line(&mut s).ok();

    s
}