import sys
sys.setrecursionlimit(10**8)

n=int(input())

S=set()
ans=[]

def f(x):
	global S,ans
	if x==1:
		print("".join(ans)[::-1])
		exit()
	
	if x not in S:
		S.add(x)
		
		if (x-1)%2==0:
			ans.append("A")
			f((x-1)//2)
			ans.pop()
		if (x-1)%3==0:
			ans.append("B")
			f((x-1)//3)
			ans.pop()

f(n)