N, K = map(int, input().split())

moji = 3
lastk = 1
k = 1
d = 2
a = 1
b = 1
while (k < K):
    lastk = k

    temp = a + b
    a = b
    b = temp
    k = k * 2 + d
    d += b
    moji += 1

MMA__s = 2 ** (moji-3)
MA___s = k - MMA__s - MMA__s + 1 - lastk

def main():
    print(moji, lastk, lastk + MA___s, lastk + MA___s + MMA__s, k)
    if lastk + MA___s >= K: # はじめの MA___ の中
        cnt = lastk
        start = 2 ** (moji-1)
    elif lastk + MA___s + MMA__s >= K: # 中盤の MMA__ の中
        return 'M' * (N-moji) + 'MMA' + bin(K-lastk-MA___s-1)[2:].zfill(moji-3).replace('0', 'A').replace('1', 'M')
    else: # 終盤の MMM__ の中
        cnt = lastk + MA___s + MMA__s
        start = 7 * 2 ** (moji-3)

    for i in range(start, 2**N):
        S = bin(i)[2:].zfill(N).replace('0', 'A').replace('1', 'M')
        if S.find('MMA') != -1:
            cnt += 1
        if cnt == K:
            return S

print(main())