n, kk = map(int, input().split())
c = 0
for i in range(3, n + 1):
    for j in range(1 << (i - 1), (1 << i) - 1):
        f = 0
        for k in range(i):
            if not ((j >> k) & 1):
                f = 1
            if f and ((j >> k) & 3) == 3:
                c += 1
                break
        if c == kk:
            ans = ['A'] * n
            for k in range(i):
                if ((j >> k) & 1):
                    ans[-k-1] = 'M'
            print("".join(ans))
            exit(0)