#include <iostream>
using namespace std;

char codificat(char c, int k) {
    if(c == '_') c = ' ';
    else if ('a' <= c and 'z' >= c){
        c = c + 'A' - 'a';
        c += (k %26);
        if (c > 'Z') c += 'A' - 'Z' - 1;
    }
    return c;
}

int main() {
    int k;
    char c;
    while (cin >> k) {
        cin >> c;
        while (c != '.') {
            cout << codificat(c,k);
            cin >> c;
        }
    cout << endl;
    }
}