#![allow(non_snake_case, unused_imports)]
use proconio::{fastout, input, marker::*};
use std::cmp::Reverse;

#[fastout]
fn main() {
    input! {
        N: usize,
    }

    let mut q = std::collections::BinaryHeap::new();

    q.push((Reverse(N), vec![]));

    loop {
        let (rv, log) = q.pop().unwrap();
        let v = rv.0;

        if v == 1 {
            let mut l = log.clone();
            l.reverse();

            println!(
                "{}",
                l.iter()
                    .map(|x: &char| x.to_string())
                    .collect::<Vec<_>>()
                    .join("")
            );
            return;
        }

        if (v - 1) % 2 == 0 {
            let mut l = log.clone();
            l.push('A');
            q.push((Reverse((v - 1) / 2), l));
        }
        if (v - 1) % 3 == 0 {
            let mut l = log.clone();
            l.push('B');
            q.push((Reverse((v - 1) / 3), l));
        }
    }
}