N,K=map(int,input().split())
result=[]
M=min(20,N)
from itertools import product
for A in product(range(2),repeat=N):
  ans=False
  for j in range(N-2):
    if A[j]==0 and A[j+1]==0 and A[j+2]==1:
      ans=True
      break
  if ans==True:
    p=[0]*N
    for i in range(N):
      if A[i]==0:
        p[i]='M'
      else:
        p[i]='A'
    t=''.join(p)
    result.append(t)
result.sort()
ans='A'*(N-M)+result[K-1]
print(ans)