#include<string>
#include<cstring>
#include<cctype>
using namespace std;
bool da[1005]={0};
char key[127][127];
string ans;
void trans(string k,string m)
{
for (char i='a';i<='z';i++)
key['a'][i]=key[i]['a']=i;
for (char i='b';i<='z';i++)
for (char j='b';j<='z';j++)
{
key[i][j]=key[i][j-1]+1;
if (key[i][j]>'z')
key[i][j]-=26;
}
int lenk=k.size();
int lenm=m.size();
for (int i=0;i<lenm;i++)
{
if (m[i]>='A'&&m[i]<='Z')
da[i]=true;
}
for (int i=0;i<lenm;i++)
{
m[i]=tolower(m[i]);
}
for (int i=0;i<lenk;i++)
{
k[i]=tolower(k[i]);
}
if(lenk<=lenm)
{
int lenk2=k.size();
while (lenk2<lenm)
{
k.append(k);
lenk2=k.size();
}
}
for (int i=0;i<lenm;i++)
{
for (char j='a';j<='z';j++)
{
if (key[j][k[i]]==m[i])
ans[i]=j;
}
if (da[i])
ans[i]=toupper(ans[i]);
cout<<ans[i];
}
}
int main()
{
string k,m,ans;
cin>>k>>m;
trans(k,m);
// system("pause");
return 0;
}