include <bits/stdc++.h>

using namespace std;

int main( ) {

string a, b;
getline(cin, a);
getline(cin, b);
int c[26];
for (int i = 0; i < 26; i++) {
	c[i] = a[i] - 65 - i;
}
for (int i = 0; i < b.length(); i++) {
	if (b[i] >= 'A' && b[i] <= 'Z')
		b[i] += c[b[i] - 65];
}
cout << b;
return 0;

}