import sys, math
sys.setrecursionlimit(10**8)

ans = []
def dfs(record:list, x:int):
    global ans
    if x == 1:
        ans = record[:]
        return

    if (x - 1)%2 == 0:
        record.append('A')
        newx = (x - 1)//2
        dfs(record, newx)
        record.pop()

    if (x - 1)%3 == 0:
        record.append('B')
        newx = (x - 1)//3
        dfs(record, newx)
        record.pop()

N = int(input())
if N == 1:
    exit(print())

dfs([], N)
ans.reverse()
print(''.join(ans))