use std::io::{self, BufRead};

fn main() {
    io::stdin().lock().lines().for_each(|l| {
        let sum = l
            .unwrap()
            .chars()
            .filter(|c| ('0'..='9').contains(c))
            .map(|c| c.to_digit(10).unwrap())
            .sum::<u32>();

        println!("{}", sum);
    });
}