N,K=map(int,input().split())
K-=1

S="yuusaan"

if K<30:
	lgt=3+4*6**(N-1)-1
	if K==0:
		print('y')
	elif K==lgt-1:
		print('n')
	elif K==lgt//2:
		print('s')
	elif K<(lgt+1)//2:
		X=(K-1)%7
		print(S[X])
	elif K>(lgt+1)//2:
		X=(K-2)%7
		print(S[X])
else:
	X=(K-2)%7
	print(S[X])