#include<iostream>
#include<cstdio>
#include<cstring>
#include<string>
#include<cctype>
#include<cstdlib>
#include<algorithm>
#include<bitset>
#include<vector>
#include<list>
#include<deque>
#include<queue>
#include<map>
#include<set>
#include<stack>
#include<cmath>
#include<sstream>
#include<fstream>
#include<iomanip>
#include<ctime>
#include<complex>
#include<functional>
#include<climits>
#include<cassert>
#include<iterator>
using namespace std;

int main() {
	string s;
	cin >> s;
	int sum = 0;
	for (int i = 0;i < s.size();i++) {
		if (isdigit(s[i])) {
			sum += s[i] - '0';
		}
	}
	cout << sum << endl;
	return 0;
}