#include<fstream>
#include<string>
#include<cstring>
#include<iostream>
using namespace std;
string k,m;
ifstream in ("vigenere.in");
ofstream out ("vigenere.out");
inline char fucker (int f,int y)
{
	return (f+y-65);
}

int main ()
{
	in>>k;
	in>>m;
	
	const int mod=k.length();
	char temp;
	bool flag=0;
	
	for (int i=0;i<m.length();++i)
	{
		if ('a'<=m[i]&&m[i]<='z')
		flag=1;
		else flag=0;
		
		temp=fucker ( toupper(m[i]),toupper(k[i%mod]) );
		
		if (flag)
			out<<char(tolower(temp));
			
		else out<<char(temp);

	}
		
	return 0;
}