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

if N >= K:
    exit(print("y"))

K -= 1

A = [(1, 2, 1, 2, 1)]
B = [7]
for _ in range(60):
    a, b, c, d, e = A[-1]
    f, g, h, i, j = a, 0, c, 0, e
    f += b+d
    h += b+d
    j += b+d
    g += (b+d)*2
    i += (b+d)*2
    A.append((f, g, h, i, j))
    B.append(f+g+h+i+j)

cnt = min(N-60, K)
if 1 <= cnt:
    N -= cnt
    K -= cnt

while 2 <= N:
    nowc = B[N-1]
    prec = B[N-2]
    if K == 0:
        print("y")
        break
    if K == prec*2+1:
        print("s")
        break
    if K == nowc-1:
        print("n")
        break
    if K < prec*2+1:
        K -= 1
        K %= prec
    else:
        K -= prec*2+2
        K %= prec
    N -= 1
else:
    print("yuusaan"[K])