import java.util.*;
 
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();
 
        long sum = 0;
        long currentNumber = 0;
 
        for (int i = 0; i < s.length(); i++) {
            char c = s.charAt(i);
 
            if (Character.isDigit(c)) {
                currentNumber = currentNumber * 10 + (c - '0');
            } else {
                sum += currentNumber;
                currentNumber = 0;
            }
        }
 
        sum += currentNumber;   // add whatever's left after the loop ends
 
        System.out.println(sum);
    }
}

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MWFiYzIz

1abc23