s = 'yuusaan'
n, k = map(int, input().split())

while n > 1:
    current_len = 0
    for c in s:
        if c in ('u', 'a'):
            block_len = 7 ** (n - 1)
        else:
            block_len = 1
        if current_len + block_len >= k:
            if c not in ('u', 'a'):
                print(c)
                exit()
            else:
                k -= current_len
                n -= 1
                break
        else:
            current_len += block_len

print(s[k-1])