import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class No0289 {
	
	public static void main(String[] args) throws NumberFormatException, IOException {
		try (BufferedReader br = 
				new BufferedReader(new InputStreamReader(System.in))) {
			String s = br.readLine().trim();
			// regex number
			int sum = countByRegex(s);			
			System.out.println(sum);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	static int countByRegex(String str) {
		int sum = 0;
		String[] strArray = str.split("");
		String numRegex = "\\d";
		Pattern p = Pattern.compile(numRegex);

		for (String s : strArray) {
			Matcher matcher = p.matcher(s);
			if (matcher.find()) {
				sum += Integer.parseInt(s);
			}
			else {
				sum += 0;
			}
		}
		return sum;
	}
}