Python merge two sorted lists function .

I can't figure out how to make it merge lists of uneven lengths or to put the left over numbers where they need to be.

This merge function takes two sorted lists and combines them into a new new list and returns that list

Code:

def merge(listA, listB):
	listA =[5, 10, 15, 20]
	listB =[3, 7, 12, 19 ]
	merg = []
	indA = 0
	indB = 0
	while indA < len(listA) and indB < len(listB):
	if listB[indB] < listA[indA]:
	merg.append(listB[indB])
	indB = indB + 1
	else:
	merg.append(listA[indA])
	indA = indA + 1
	return merg
	listA =[5, 10, 15, 20,14,23,34]
	listB =[3, 7, 12, 19 ]
	pear = merge(listA,listB)
	print(pear)

end:

heres a better link

https://gist.github.com/anonymous/7d3aa8ea49133518e66a881d552c9a7b