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

fn main() {
    let mut buf = String::new();
    io::stdin().read_to_string(&mut buf).unwrap();

    let lines: Vec<String> = buf.lines().map(ToOwned::to_owned).collect();

    let answer: Result<i32, _> = lines
        .into_iter()
        .map(|l| l.chars().filter(char::is_ascii_digit).collect())
        .map(|s: String| [s.chars().next().unwrap(), s.chars().last().unwrap()].to_owned())
        .map(String::from_iter)
        .map(|s| s.parse::<i32>())
        .sum();

    let answer = answer.unwrap();

    print!("{answer}");
}