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: VonFon Women's Sleeeveless Bohemian Chiffon Maxi Long Beach Dress
Product description: VonFon Women's Sleeeveless Bohemian Chiffon Maxi Long Beach Dress
Product feature: Solid Color, Sleeveless, Chiffon, Maxi Long, Beach Dress, ASIN: B00RBMUAL4, Date first listed on Amazon: December 22, 2014, Average Customer Review: 1.0 out of 5 stars 1 customer review
Product brand: Vonfon
Target attributes: Length
Answer: attribute: length
value: maxi
source: product feature
attribute: length
value: maxi
source: product title
attribute: length
value: maxi
source: product description