package yukicoder;

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

public class Yuki289 {
	
	public static void main( String[] args ) {
	
		Scanner scan = new Scanner(System.in);
		String str = scan.next();
		scan.close();
		String[] strarr = str.split("");
		String strNumber = "[1-9]";
		Pattern p = Pattern.compile(strNumber);
		int number = 0;
		
		for (int i = 0; i < strarr.length; i++ ){
			Matcher m = p.matcher(strarr[i]);

			if(m.find()){
				number += Integer.parseInt(strarr[i].toLowerCase());
			}
		}
	    System.out.print(number);	
	}
}