#include<iostream>
#include<cstdio>
#include<map>
#include<vector>
#include<queue>
#include<stack>
#include<cmath>
#include<string>

using namespace std;

string cip,mes;


int main()
{
	ios_base::sync_with_stdio(0);
	cin>>cip;
	while(cip!="0")
	{
		cin>>mes;
		int k=0;
		for(int i=0;i<mes.length();i++)
		{
			mes[i]+=cip[k]-'A'+1;
			if(mes[i]>'Z')
				mes[i]-=26;
			k++;
			if(k==cip.length())
				k=0;
		}
		cout<<mes<<endl;
		cin>>cip;
	}
	return 0;
}