N = int(input())

d = dict()
l = []
def calc(X):
	if X == 1:
		return 1
	elif X in d:
		return d[X]
	else:
		r = X % 2
		rr = X % 3
		
		f = 0
		if r == 1:
			l.append(0)
			f = calc((X - 1) // 2)
			if f == 1:
				return 1
			else:
				l.pop()
		f = 0
		if rr == 1:
			l.append(1)
			f = calc((X - 1) // 3)
			if f == 1:
				return 1
			else:
				l.pop()
		d[X] = 0
		return 0
calc(N)
ll = []
for s in l[::-1]:
	if s == 0:
		ll.append("A")
	else:
		ll.append("B")
print("".join(ll))