#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#pragma warning(disable:4996)

void main()
{
    char v[9999];
    int n;

    scanf("%d", &n);
    scanf("%s", &v);

    printf("\n\n");

    for (int i = 0; i < strlen(v); i++) {
        printf("%c", v[i] + n);
    }

    exit(0);
}