#include <stdio.h>

using namespace std;

int main()
{
    FILE *in=stdin;
    FILE *out=stdout;
    int n;
    
    fscanf(in,"%d",&n);
    if(n==2)
        fprintf(out,"AB\n11");
    if(n==3)
        fprintf(out,"AAB\n212");
    if(n==4)
        fprintf(out,"NO");
    if(n==5)
        fprintf(out,"NO");
    if(n==6)
        fprintf(out,"AABB\n221212");
    if(n>6)
        fprintf(out,"NO");
        
    return 0;
}
