for i in range(9,-1,-1):
	if i%2!=0:
		for j in range(10,0,-1):
			print(i*10+j,end=" ")
	else:
		for k in range(1,11):
			if i==0:
				print(i*10+k,end=" ")
			else:
				print(i*10+k,end=" ")
	print()