杭电acm2113

#include <stdio.h>

int main() {
	
	int n, i, ans, flag=1;
	while(~scanf("%d", &n)) {
		ans = 0;
		while(n) {
			i = n % 10;
			if(i%2==0)
				ans += i;
			n /= 10;
		}
		
		if(flag) {
			printf("%d\n", ans);
			flag = 0;
		} else
			printf("\n%d\n", ans);
		
	}
	
	return 0;
}