import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;

public class Hello {
    private static Scanner sc = new Scanner(System.in);
    private static Scanner in;
    private static String message;
    private static String mappedKey;
    public static void main(String...s){
        String text  = sc.nextLine();
        String key = sc.nextLine();
        StringBuilder outputT = new StringBuilder();
        StringBuilder outputK = new StringBuilder();
        try {
            FileReader fstext = new FileReader(text);
            FileReader fsKey = new FileReader(key);
            BufferedReader readerT = new BufferedReader(fstext);
            BufferedReader readerK = new BufferedReader(fsKey);
            String lineT = readerT.readLine();
            String lineK = readerK.readLine();
            while(lineT != null && lineK != null) {
                outputT = outputT.append(lineT);
                lineT = readerT.readLine();
                outputK = outputK.append(lineK);
                lineK = readerK.readLine();
            }

            readerT.close();
            readerK.close();
        }catch (FileNotFoundException f){
            System.out.println("File not found");
        }
        catch(IOException ex) {
            System.out.println( "Error reading file ");
        }

        String enc = encrypt(outputT.toString(), outputK.toString());
        System.out.println(enc);
        System.out.println(decrypt(enc, outputK.toString()));
        System.out.println();
    }
    static String encrypt(String text, final String key) {
        String res = "";
        text = text.toUpperCase();
        for (int i = 0, j = 0; i < text.length(); i++) {
            char c = text.charAt(i);
            if (c < 'A' || c > 'Z') continue;
            res += (char)((c + key.charAt(j) - 2 * 'A') % 26 + 'A');
            j = ++j % key.length();
        }
        return res;
    }

    static String decrypt(String text, final String key) {
        String res = "";
        text = text.toUpperCase();
        for (int i = 0, j = 0; i < text.length(); i++) {
            char c = text.charAt(i);
            if (c < 'A' || c > 'Z') continue;
            res += (char)((c - key.charAt(j) + 26) % 26 + 'A');
            j = ++j % key.length();
        }
        return res;
    }
}