use std::collections::HashMap;

use proconio::input;

fn main() {
    input! {
        n: usize,
    }

    let mut memo = HashMap::new();
    memo.insert(1, Some(String::new()));
    rec(n, &mut memo);

    let ans = memo[&n].clone().unwrap();
    println!("{}", ans);
}

fn rec(n: usize, memo: &mut HashMap<usize, Option<String>>) {
    if memo.contains_key(&n) {
        return;
    }

    if n % 2 == 1 {
        let prev = n / 2;

        rec(prev, memo);

        if let Some(mut seq) = memo[&prev].clone() {
            seq.push('A');
            memo.insert(n, Some(seq));
            return;
        }
    }

    if n % 3 == 1 {
        let prev = n / 3;

        rec(prev, memo);

        if let Some(mut seq) = memo[&prev].clone() {
            seq.push('B');
            memo.insert(n, Some(seq));
            return;
        }
    }

    memo.insert(n, None);
}