#include <stdio.h>
#include <iostream>
using namespace std;
int main()
{
    int n;
    scanf("%d",&n);
    if (n==2) printf("AA\n21\n");
    else if (n==3) printf("AAA\n212\n");
    else if (n==4) printf("ABA\n2121\n");
    else if (n==6) printf("AABB\n221212\n");
    else printf("NO\n");
    return 0;
}