from collections import defaultdict
import sys
sys.setrecursionlimit(10**7)

n = int(input())
d = defaultdict(bool)

if n == 1:
    print("")
    exit()

d[1] = True


def dfs(now):
    if now in d:
        return d[now]
    if (now - 1) % 2 == 0 and dfs((now - 1) // 2):
        d[now] = True
        return True
    if (now - 1) % 3 == 0 and dfs((now - 1) // 3):
        d[now] = True
        return True
    return False


dfs(n)

now = n
ans = []
while now > 1:
    if (now - 1) % 2 == 0 and d[(now - 1) // 2]:
        ans.append("A")
        now = (now - 1) // 2
    else:
        ans.append("B")
        now = (now - 1) // 3

ans.reverse()
print("".join(ans))