import java.io.*;
import java.util.*;
import java.util.function.*;
import java.util.stream.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        long n = sc.nextLong();
        System.out.println(dfw(n));
    }
    
    static StringBuilder dfw(long x) {
        if (x == 1) {
            return new StringBuilder();
        }
        if ((x - 1) % 2 == 0) {
            StringBuilder ans = dfw((x - 1) / 2);
            if (ans != null) {
                ans.append("A");
                return ans;
            }
        }
        if ((x - 1) % 3 == 0) {
            StringBuilder ans = dfw((x - 1) / 3);
            if (ans != null) {
                ans.append("B");
                return ans;
            }
        }
        return null;
    }
}
class Scanner {
    BufferedReader br;
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() {
        try {
            br = new BufferedReader(new InputStreamReader(System.in));
        } catch (Exception e) {
            
        }
    }
    
    public int nextInt() {
        return Integer.parseInt(next());
    }
    
    public long nextLong() {
        return Long.parseLong(next());
    }
    
    public double nextDouble() {
        return Double.parseDouble(next());
    }
    
    public String next() {
        try {
            while (!st.hasMoreTokens()) {
                st = new StringTokenizer(br.readLine());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            return st.nextToken();
        }
    }
    
}