n, k = map(int, input().split())
if n >= k:
    print("y")
    exit()

la = [4]
lb = [3]
le = [7]
for _ in range(n):
    if le[-1] >= k:
        break

    na = la[-1] * 4
    nb = la[-1] * 3 + lb[-1]
    la.append(na)
    lb.append(nb)
    le.append(na + nb)

S = "yuusaan"

l = len(le)
k -= n - l
if k <= 0:
    print("y")
    exit()

S = "yuusaan"
p = len(la) - 1
while p >= 0:
    if p == 0:
        print(S[k - 1])
        exit()
    for s in S:
        if k == 1:
            print(s)
            exit()
        if s in "ua":
            if k > le[p - 1]:
                k -= le[p - 1]
            else:
                p -= 1
                break
        else:
            k -= 1