Output cannot be generated

#1

i have tried this challenge but i am unable to understand that how can we implement this and when i tried i get the error which you can check in below mentioned url of the code . please tell me the correct way to approach this problem.

#2

@Raghavsingla522 There is a small typo in your code, j -loop, there is i<=i which should be j<=i.
Also add spaces after printing.