#include <stdio.h>
#include <cs50.h>
#include <stdlib.h>
#include <string.h>

int
main(int argc, char *argv[])
{
    if (argc != 1)
        return 1;

    int k = atoi(argv[1]);
    string phrase = GetString();
    int length = strlen(phrase);

    for (int i = 0, n = length; i < n; i++)
    {
        if (phrase[i] >= 65 && phrase[i] <= 90)
            phrase[i] = ((phrase[i] + k) - 65) % 26 + 65;
        else if (phrase [i] >= 97 && phrase[i] <= 122)
            phrase[i] = ((phrase[i] + k) - 97) % 26 + 97;
        else
            phrase[i] = phrase [i];
        printf("%c", phrase[i]);
    }

    printf("\n");

    return 0;
}