while True:
k,e=0,0
try:
e,k = map(int,input().split())
except:
break
s=1
while s<e:
L = [s,s+1,e-1,e]
if k in L:
for i in L:
if i !=k:
print(i, end = " ")
print()
break
s+=2
e-=2