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

static char s[1024];

int main(void)
{
	for (;;) {
		int l, k;
		gets(s);
		if (s[0] == '0') break;
		k = strlen(s);
		for (l = 0;; l++) {
			char c = getchar();
			if (c == 0x0a || c == 0x0d) {
				putchar('\n');
				break;
			}
			putchar((c-'A'+s[l%k]+1-'A')%26+'A');
		}
	}
	return 0;
}