a=int(input())
b=int(input())
for i in range (a,b):
print (i,end=" ")
print()
for j in range (b,a,-1):
print (j, end=" ")
YT1pbnQoaW5wdXQoKSkKYj1pbnQoaW5wdXQoKSkKCmZvciBpIGluIHJhbmdlIChhLGIpOgoJcHJpbnQgKGksZW5kPSIgIikKCnByaW50KCkKCmZvciBqIGluIHJhbmdlIChiLGEsLTEpOgoJcHJpbnQgKGosIGVuZD0iICIpCg==