n = int(input())
d = dict()
d[1] = 1

def calc(x):
	if x in d: return 1
	if (x-1) % 2 == 0 and calc((x-1) // 2) == 1:
		d[x] = 1
		return 1
	if (x-1) % 3 == 0 and calc((x-1) // 3) == 1:
		d[x] = 1
		return 1
	d[x] = 0
	return 0

assert(calc(n))

x = n
a = []
while x > 1:
	if (x - 1) % 2 == 0 and calc((x-1) // 2) == 1:
		x = (x-1) // 2
		a.append('A')
	else:
		assert (x - 1) % 3 == 0 and calc((x - 1) // 3) == 1
		x = (x-1) // 3
		a.append('B')

print(''.join(a[::-1]))