from functools import lru_cache

@lru_cache(maxsize=None)
def req(N: int) -> list[str] | None:

    if N == 1:
        return []

    N -= 1

    for v in (2, 3):
        if N % v == 0:
            s = req(N // v)
            if s is not None:
                s.append('A' if v == 2 else 'B')
                return s

    return None

N = int(input())

print("".join(req(N)))