n=int(input())
d={1:0}
INF=1<<60
def f(x):
  if x in d:
    return d[x]
  d[x]=INF
  if (x-1)%2==0:
    nx=(x-1)//2
    if (nx-1)%2==0 or (nx-1)%3==0:
      d[x]=min(d[x],f((x-1)//2)+1)
  if (x-1)%3==0:
    nx=(x-1)//3
    if (nx-1)%2==0 or (nx-1)%3==0:
      d[x]=min(d[x],f((x-1)//3)+1)
  return d[x]
f(n)
c=[0]*len(d)
for k,v in d.items():
  if v!=INF:
    c[v]=k
ans=[]
for i,j in zip(c,c[1:]):
  if i*2+1==j:
    ans+='A',
  else:
    ans+='B',
print(*ans,sep='')