def unpack(string):
	ll = string.split('-_')
	ll.remove("") # Remove empty line
	el_col = ll[0].count('-')

	post_ll = []
	for i in ll:
		temp = i.split("-")
		# Multi-add (2, 3 or 5 elements)
		if el_col == 1:
			post_ll.append([int(temp[0]), int(temp[1])])
		elif el_col == 2:
			post_ll.append([int(temp[0]), int(temp[1]), int(temp[2])])
		elif el_col == 4:
			post_ll.append([int(temp[0]), int(temp[1]), int(temp[2]), int(temp[3]), int(temp[4]) ])
	return post_ll

def pack(ll):
	string = ''
	for el in ll:
		for i in el:
			string += str(i) + '-'
		string += '_'
	return string