#include <iostream>
using namespace std;

int main()
{
	char s[10000];
	int sum = 0;

	cin >> s;

	for (int i = 0; s[i]; i++)
	{
		if ('/' < s[i] && s[i] < ':')
		{
			sum += (int)(unsigned)s[i] - 48;
		}
	}

	cout << sum;
}