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


int
chrcmp(void const * a, void const * b)
{
	return (*(char const *) a) - *((char const *) b);
}


int
priority(int c)
{
	if (c >= 'A' && c <= 'Z')
		return 27 + c - 'A';
	if (c >= 'a' && c <= 'z')
		return 1 + c - 'a';
	fprintf(stderr, "Unexpected priority request: %c\n", c);
	return -1;
}


int
main()
{
	char buf[BUFSIZ];
	int score = 0;

	while (fgets(buf, sizeof(buf), stdin)) {
		int len, i, j;

		len = strlen(buf);
		if (len && buf[len - 1] == '\n')
			--len;
		if (len % 2 == 1)
			fprintf(stderr, "Unexpected length: %d\n", len);

		qsort(buf, len / 2, 1, chrcmp);
		qsort(buf + len / 2, len / 2, 1, chrcmp);

		i = 0;
		j = len / 2;
		while (i < len / 2 && j < len) {
			if (buf[i] < buf[j])
				++i;
			else if (buf[j] < buf[i])
				++j;
			else
				break;
		}
		if (i >= len / 2 || j >= len) {
			fprintf(stderr, "No match found in %s\n", buf);
			return -1;
		}
		score += priority(buf[i]);
	}

	printf("Score: %d\n", score);

	return 0;
}