/*
 *      vigenere.java
 *      
 *      Copyright 2011 Contest Team 51 <cteam51@pc-221-52>
 *      
 *      This program is free software; you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License as published by
 *      the Free Software Foundation; either version 2 of the License, or
 *      (at your option) any later version.
 *      
 *      This program is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *      GNU General Public License for more details.
 *      
 *      You should have received a copy of the GNU General Public License
 *      along with this program; if not, write to the Free Software
 *      Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 *      MA 02110-1301, USA.
 */
import java.util.*;

public class vigenere {

	public static void main (String args[]) {		
	
	Scanner sc = new Scanner(System.in);
	
	String radek1=sc.nextLine();
	String radek2;
	while(radek1.compareTo("0")!=0){
		radek2=sc.nextLine();
		
	String vystup="";
	
	char znak;
	int modulo=radek1.length();
	
	for(int i=0;i<radek2.length();i++){
		znak = (char)((radek1.charAt(i % modulo))+(radek2.charAt(i))-64);

		if(znak>90){znak-=26;}
		
		vystup+=znak;
	}
	System.out.println(vystup);
	
	radek1=sc.nextLine();
	}
	

	}
}