#include <bits/stdc++.h>
using namespace std;

int main()
{
	char key[1010];
	while (fgets(key, 1005, stdin), key[0] != '0')
	{
		int i = 0;
		int ch;
		while ((ch = getchar()) != '\n') {
			putchar(((ch-'A')+(key[i++]-'A')+1)%('Z'-'A'+1)+'A');
			if (key[i] == '\n') i = 0;
		}
		putchar('\n');
	}
	return 0;
}