def sectors(arr):
	l, last = 0, len(arr) - 1
	while l < last:
		l = arr[l+1:].index(arr[0]) + l + 1
		if last % l != 0:
			continue
		for i in range(last // l):
			if arr[0:l] != arr[l * i: l * (i + 1)]:
				break
		else:
			break
	return l
	
print(sectors([1,1,1,1,]))