#include <iostream>
#include <fstream>
#include <string> 
#include <cmath>  
#include <cstdlib>
#include <ctime>
#include <vector>
#include <algorithm>
#include <numeric>
#include <cctype>
using namespace std;

int main() {
	int i;
	string S,SS;
	cin >> S;
	vector<int> a;
	for ( i = 0; i < S.length(); i++) {
		if (isdigit(S[i]) != 0) { 
			SS = S[i];
			a.push_back(stoi(SS)); };
	}
	cout << accumulate(a.begin(), a.end(), 0) << endl;
	return 0;
}