#include<cstdio>
#include<iostream>
#include<cstring>
using namespace std;
int main(){
	freopen("vigenere.in","r",stdin);
	freopen("vigenere.out","w",stdout);
	char k[210];
	char C[2010];
	char M[2010];
	int key[210];
	cin.getline(k,201);
	cin.getline(C,2001);
	int i;
	int len=strlen(C);
	int lk=strlen(k);
	for(i=0;i<lk;i++)
	{
		if(k[i]>=65&&k[i]<=90)
			key[i]=k[i]-64;
		if(k[i]>=97&&k[i]<=122)
			key[i]=k[i]-96;
		}	
	for(i=0;i<len;i++)
	{
		if(C[i]>=65&&C[i]<=90)
		{
			int temp = C[i]-64;
			temp=(temp+27-key[i%lk])%26;
			if(temp==0) temp=26;
			M[i] = temp+64;
			
			}
		if(C[i]>=97&&C[i]<=122)
		{
			int temp = C[i]-96;
			temp=(temp+27-key[i%lk])%26;
			if(temp==0) temp=26;
			M[i] = temp+96;
			}
		}//k8587 8:30 - 9:00
			cout<<M;
	}