#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <vector>
#include <cmath>
#include <algorithm>

using namespace std;

typedef long long ll;

int main() {
    //freopen("input.txt", "r", stdin);
    //freopen("output.txt", "w", stdout);
    
    int n;
    cin >> n;
    
    if (n == 2) {
        puts("AA\n11\n");
    } else if (n == 6) {
        puts("AABB\n221212\n");
    } else {
        puts("NO\n");
    }
}
