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

int get_prio (char c) {
	int r = (int) (c - 'a'+1);
	if (r > 0) return r;
	return r + 'A' - 7;
}

int main () {
	char cur[50];
	int half = 0;
	u_int64_t mask = 0;
	int sum = 0;

	while (fgets(cur,50,stdin) != NULL) {
		int i;
		half = strlen(cur) / 2;
		for (i = 0; i<half; i++) {
			//printf("%c %d\n", cur[i], get_prio(cur[i]));
			mask |= (1LL << get_prio(cur[i]));
		}
		//printf("half!\n");
		for (i=half; i<strlen(cur)-1; i++) {
			//printf("%c %d\n", cur[i], get_prio(cur[i]));
			if (mask & (1LL << get_prio(cur[i]))) {
				// printf("%c", cur[i]);
				sum += get_prio(cur[i]);
				break;
			}
		}
		mask = 0;
	}
	printf("%d\n", sum);

}