import sys, time, random
from collections import deque, Counter, defaultdict
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
inf = 2 ** 61 - 1
mod = 998244353

def f(x, S):
    if x == 1:
        return S
    if (x - 1) // 2 >= 1 and (x - 1) % 2 == 0:
        p = f((x - 1) // 2, S + 'A')
        if p is not None:
            return p
    if (x - 1) // 3 >= 1 and (x - 1) % 3 == 0:
        p = f((x - 1) // 3, S + 'B')
        if p is not None:
            return p
        
    return None

print(f(ii(), '')[::-1])