S = input
R = range
P = print
def I(): return int(S())
def M(): return map(int, S().split())
def L(): return list(M())
def O(): return list(map(int, open(0).read().split()))
def yn(b): print("Yes" if b else "No")
biga = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
smaa = "abcdefghijklmnopqrstuvwxyz"

from functools import cache

@cache
def f(n):
	if n == 1:
		return ""
	if n % 2 == 1:
		d = f(n // 2)
		if d != None:
			return d + "A"
	if n % 3 == 1:
		d = f(n // 3)
		if d != None:
			return d + "B"
	return None

n = I()
print(f(n))