I am using the following code to generate TC for hacks for question E of round 640 but the hacking verdict is generator crashed. What does it mean and where I am going wrong.

from random import randint as rd
print(10)
for i in range(10):
	print(800)
	for j in range(799):
		print(rd(700,799),end=' ')
	print(rd(700,799))