import math

array = []
n = 0
result = 0

def index_power(array, n):
	"""
	Find Nth power of the element with index N.
	"""
	if n >= len(array):
		result = -1
	else:
		result = math.pow(array[n], n)
	return result

if __name__ == '__main__':
	#These "asserts" using only for self-checking and not necessary for auto-testing
	assert index_power([1, 2, 3, 4], 2) == 9, "Square"
	assert index_power([1, 3, 10, 100], 3) == 1000000, "Cube"
	assert index_power([0, 1], 0) == 1, "Zero power"
	assert index_power([1, 2], 3) == -1, "IndexError"
	print("ok")


