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

public class AllNumber{
	public static void main(String... args){
		Scanner scan = new Scanner(System.in);
		String target = scan.next();
		String[] number = target.split("");
		
		for(int i = 0; i < number.length; i++){
			if(isNumber(number[i])){
				continue;
			}else{
				number[i] = "not";
			}
		}
		System.out.println(allPlus(number));

	}

	public static boolean isNumber(String str){
		String regex = "[0-9]";
		Pattern p = Pattern.compile(regex);
		Matcher m = p.matcher(str);
		return (m.find())?true:false;
	}

	public static int allPlus(String[] numberList){
		
		int result = 0;

		for(String str : numberList){
			if(str.equals("not")){
				continue;
			}
			result += Integer.parseInt(str);

		}

		return result;

	}
}