import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################


def L(k):
    return 2 * 4 ** k - 1

def f(k, n):
    #print(k, n)
    if k == 1:
        return "yuusaan"[n]
    if n == 0:
        return "y"
    elif n - 1 < 2 * L(k-1):
        return f(k-1, (n - 1) % L(k-1))
    elif n == 2 * L(k-1) + 1:
        return "s"
    elif n - 2 - 2 * L(k-1) < 2 * L(k-1):
        return f(k-1, (n - 2 - 2 * L(k-1)) % L(k-1))
    else:
        return "n"
    
def g(k, n):
    if n < k:
        return "y"
    elif k <= 30:
        return f(k, n)
    else:
        n -= k - 30
        return f(30, n)

# from random import randint
# for _ in range(100):
#     K = randint(1, 1000)
#     N = randint(0, 10 ** 15)
#     if L(K) <= N:
#         continue
#     if g(K, N) != f(K, N):
#         print(K, N)
#         print(g(K, N), f(K, N))
#         break
k, n = na()
n -= 1
print(g(k, n))