import sys
import clr
clr.AddReference('ProtoGeometry')
from Autodesk.DesignScript.Geometry import *
# The inputs to this node will be stored as a list in the IN variables.
listA = IN[0]
if isinstance(listA, list):
listA = UnwrapElement(listA)
else:
listA = UnwrapElement([listA])
curve = []
for i in listA:
if i.GetType().ToString() == "Autodesk.DesignScript.Geometry.Line":
curve.append(i)
OUT = curve
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