#include <algorithm>
#include <fstream>
#include <iostream>
using namespace std;

int main() {
    int n;
    cin >> n;
    if (n == 2) {
        cout << "AA\n11\n";
        return 0;
    }
    if (n & 1) {
        cout << "NO\n";
        return 0;
    }
    int p = 0;
    while ((1 << p) <= n) {
        ++ p;
    }
    int q = p - 1;
    p = (p - 1) * 2 - 1;
    cout << string(p + 1, 'A') << "\n";
    for (int i = 1; i <= (1 << q); ++ i) {
        cout << 2;
        if (i <= n - (1 << q)) {
            cout << 1;
        }
    }
    cout << "\n";
    return 0;
}
