#include <iostream>
#include <cstdio>
#include <cstring>
#include <cmath>
#include <algorithm>
using  namespace std;

char c[1005],m[1005],k[105];//c是密文，m是明文，k是钥匙 
int p;
int main()
{
	freopen("vigenere.in","r",stdin);
	freopen("vigenere.out","w",stdout);
	gets(k);
	
	int lenk=strlen(k);
	for(int i=0;i<lenk; i++)
	{
		if(k[i]>='a')
			k[i]-=32;
	}
	
	gets(c);
	int lenc=strlen(c);
	for(int i=0;i<lenc;i++)
	{
		if(c[i]<=90)
		{
			m[i]=c[i]-k[p]+'A';
			p=(p+1)%lenk;
			if(m[i]<65)
				m[i]+=26;
		}
		else
		{
			m[i]=c[i]-k[p]+'A';
			p=(p+1)%lenk;
			
			if(m[i]<97)
				m[i]+=26;
		}
		cout<<m[i];
	}
	cout<<endl;
	return 0;
}