import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

class Yukicoder {
    static public void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String S = scanner.next();
        if (S.isEmpty() || S.length() > 10000) System.exit(1);

        Pattern p = Pattern.compile("\\d");
        String tmp;
        int sum = 0;
        for (int i = 0; i < S.length(); i++) {
            tmp = S.substring(i, i+1);
            Matcher m = p.matcher(tmp);
            if (m.find()) sum += Integer.parseInt(tmp);
        }
        System.out.println(sum);
    }
}