n,k = map(int,input().split())
if k<=n: exit(print("y"))
a = [7]; n -= 1; k -= 1
for i in range(20):
    if a[-1]>k: break
    a.append(a[-1]*4+3)
m = len(a)-1
if n>m: k -= n-m; n = m
for i in range(m,0,-1):
    if k==0: exit(print("y"))
    if k==1+a[i-1]*2: exit(print("s"))
    if k==2+a[i-1]*4: exit(print("n"))
    k = (k-1)%(a[i-1]*2+1)%a[i-1]
print("yuusann"[k])