#include <stdio.h>
#include <string.h>
int main() {
	char secret[50];
	int n;
	scanf("%d\n",&n);
	scanf("%s", &secret);
	for (int i = 0; i < 50; i++) {
		if (secret[i] + n > 'z') {
			int move = (secret[i] + n -'z') % 26;
			secret[i] = 'a' + move -1;
		}
		else if(secret[i]>='a' && secret[i]<='z') {
			secret[i] += n;
		}
	}
	printf("%s",secret);
	return 0;
}```