#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>

void main(void){
	char str[100000];
	int sum = 0 , i = 0 ;
	while(str[i] != '\0'){
		if(isdigit(str[i])){
			sum += atoi(str[i]);
		}	
	}
	printf("%d\n",sum);
}