Grid challenge of hacker rank

gridchallenge.py

import copy

def checking_grid():
	N = int(input())
	L, iL, answer = [], [], ''
	for i in range(N):
		L.append(list(input()))

	for idx,item in enumerate(L):
		item.sort()
		iL.append([inner[idx] for inner in L])
	checkL = copy.deepcopy(iL)
	for idx,item in enumerate(iL):
		item.sort()
		if item not in checkL:
			answer = 'NO'
		else:
			answer = 'YES'

	print(answer)
times = int(input())
for i in range(times):
	checking_grid()