import sys
sys.setrecursionlimit(10**6)
import pypyjit
pypyjit.set_param('max_unroll_recursion=-1')

N = int(input())

def dfs(x,y):
    if x <= 1:
        if x == 1:
            print("".join(y[::-1]))
            exit()
        else:
            return

    if x%2 == 0 and (x-1)%3 == 0:
        y.append("B")
        dfs((x-1)//3,y)
        y.pop()

    if (x-1)%2 == 0:
        y.append("A")
        dfs((x-1)//2,y)
        y.pop()

    if (x-1)%3 == 0:
        y.append("B")
        dfs((x-1)//3,y)
        y.pop()

dfs(N,[])