import java.io.*;
import java.util.*;
public class SumAbcFile {
    public static void main(String[] args) throws IOException {
        try {
            Scanner in = new Scanner(new File(args[0]));
            PrintWriter writer = new PrintWriter(new File(args[1]));
            int number = 0, sum = 0;
            boolean non_positive = false;
            while (in.hasNextLine()) {
                String cur_line = in.nextLine();
                cur_line = cur_line.toLowerCase();
                String[] a = cur_line.split("[-a-j]");
                for (int i = 0; i < a.length; i++) {
                    for (int k = 0; k < a[i].length(); k++) {
                        if (a[i].charAt(k) - 'a' < 10 && a[i].charAt(k) - 'a' > 0) {
                            number = number * 10 + a[i].charAt(k) - 'a';
                        } else if (k == 0 && a[i].charAt(k) == '-') {
                            non_positive = true;
                        } else {
                            throw new NumberFormatException();
                        }
                    }
                    if (non_positive) {
                        sum = sum - number;
                    } else {
                        sum = sum + number;
                    }
                    non_positive = false;
                }
            }
            writer.print(sum);
        } catch (FileNotFoundException e) {
            System.out.println("Error: Required file not found");
        } catch (IndexOutOfBoundsException e) {
            System.out.println("Please, enter a both names of files");
        } catch (IllegalStateException e) {
            System.out.println("IllegalStateException");
        }
    }
}