Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: Sheinside Women's Flare Pleated Midi Skirt in Multicolor
Product description: Sheinside is an International leading fashion brand , providing the latest fashionbale clothing for aged 18-35 women. Sheinside online shop do sell based on our excellent designs and proven reliability. All item quality can be guaranteed. Choose us, believe in us!
Product feature: PLEASE CHOOSE YOUR SIZE BASED ON BUST MEASUREMENT IN THE IMAGE, Material : Polyester, Hand Wash Seperately in Cold Water., Pattern Type :Plain Silhouette :Flared Dresses Length :Knee Length Style :Vintage, Imported, Designed and Produced by Sheinside., Package Dimensions: 13 x 9.1 x 1.2 inches, Shipping Weight: 12 ounces, ASIN: B00IFXPW16, Item model number: skirt131218011fba, Date first listed on Amazon: February 14, 2014, Average Customer Review: 3.4 out of 5 stars 48 customer reviews
Product brand: Sheinside
Target attributes: Length
Answer: attribute: length
value: knee
source: product feature
attribute: length
value: midi
source: product title