#include <stdio.h>

int const MAXN = 255;
int const MAXA = 'z' - 'a' + 1;
int const SH = 13;

int main()
{
	int n;
	scanf("%d\n", &n);
	char s[MAXN + 1];
	fgets(s, MAXN, stdin);

	for (int i = 0; i < n; ++ i)
	{
		if (s[i] >= 'a' && s[i] <= 'z')
			s[i] = 'a' + (s[i] - 'a' + SH) % MAXA;
		if (s[i] >= 'A' && s[i] <= 'Z')
			s[i] = 'A' + (s[i] - 'A' + SH) % MAXA;
	}
	s[n] = 0;
	printf("%s\n", s);
	return 0;
}