vigenere

import java.util.*;
import java.io.*;
import java.math.*;

class Solution {

    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        String text = in.nextLine();
        String code = in.next();
        int i = 0;
        for(char c : text.toCharArray())
        {
            if(Character.isLetter(c))
            {
                int letter = c - 'a';
                int cod = code.charAt(i) - 'a';
                letter = (letter +26 - cod)%26 + 'a';
                System.out.print((char) letter);
                i = (i+1)%code.length();
            }
            else
                System.out.print(c);
        }
    }
}