#include <iostream>
#include <string>

using namespace std;

int main()
{
    int k;
    cin >> k;

    string s;
    cin.ignore();
    getline(cin, s);
    
    for (char& c : s) {
        if (!isalpha(c)) {
            continue;
        }
        
        if (isupper(c)) {
            c -= 'A';
            c = (c + k) % 26;
            c = (c + 26) % 26;
            c += 'A';
        }        
        if (islower(c)) {
            c -= 'a';
            c = (c + k) % 26;
            c = (c + 26) % 26;
            c += 'a';
        }
    }

    cout << s;

    return 0;
}