#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;

int main() {
	char c[100] = { 0 };
	int n=0;
	cin >> n;
	if (n > 25)  n = (n - (n - 1) / 25) % 25;
	for (int i = 0; i <= 99; i++)
	{
		
		cin >> c[i];
		if (int(c[i] + n) <= 122)
			cout << char(c[i] + n);
		else cout << char(c[i] + n - 26);
		
	}
	return 0;
}