#include <stdio.h>
#include <malloc.h>
#include <ctype.h>
#include <string.h>
int main()
{
	char s[10001];
	int sum = 0;
	for (int i = 0;i < strlen(s);i++) {
		if (isdigit(s[i])) {
			sum += s[i] - '0';
		}
	}
	printf("%d\n",sum);
}