/* 
 * File:   viegnere.c
 * Author: cteam33
 *
 * Created on November 13, 2011, 9:18 AM
 */

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

/*
 * 
 */
int main(int argc, char** argv) {
    char key[1001];
    char message[100001];
    int keyLen,i,j,cnt;
    
    while(1){
        if(scanf("%s %s",key,message) != 2) break;
        keyLen = strlen(key);
        for(i =0, cnt = strlen(message); i<cnt;i++){
            printf("%c",(message[i]+key[i%keyLen]-2*'A')%26 + 'A' + 1);
        }
        printf("\n");
    }
    
    return 0;
}