#include <iostream>
#include <cctype>
using namespace std;
int main() {
int k;
char n;
cin >> k >> n;
if (islower(n)){
cout << (char)((n - 'a' + k)%26 + 'a') << endl;
}
if (isupper(n)){
cout << (char)((n - 'A' + k)%26 + 'A') << endl;
}
return 0;
}
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