#include <bits/stdc++.h>
using namespace std;

int main() {
	char a[26];
	int ofs;
	cin >> ofs;
	ofs % 26;
	for (int i = 0; i < 26; i++) {
		a[i] = 'A' + i;
	}
	for (int i = ofs; i < 26;) {
		cout << a[i];
	}
	for (int i = 0; i < ofs; i++) {
		cout << a[i];
	}
	return 0;
}