#include <iostream>

using namespace std;

int n;

int main() {
    cin >> n;
    if (n == 2) {
        cout << "A\n11";
        return 0;
    }
    if (n == 3) {
        cout << "ABA\n121";
        return 0;
    }
    if (n == 6) {
        cout << "AABB\n221212";
        return 0;
    }
    cout << "NO";

    return 0;
}