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: Womens Sleeveless Maxi Long Chiffon Beach Ball Gown Evening Party Dress
Product description: SIZE S: bust 86,Waist 66-76 ,length 130 SIZE M: bust 88,Waist 68-78, length 132 SIZE L:bust 92,Waist 70-90, length 134 SIZE XL:bust 96,Waist 72-92, length 136
Product feature: Material:Chiffon, Size: S M L XL, Sleeve Style: Sleeveless, Please note that slight color difference should be acceptable due to the light and screen., Full-Length, ASIN: B00WQY6D0O, Date first listed on Amazon: April 27, 2015, Average Customer Review: 2.0 out of 5 stars 1 customer review
Product brand: ACEFAST INC
Target attributes: Length
Answer: attribute: length
value: gown
source: product title
attribute: length
value: maxi
source: product title
attribute: length
value: full-length
source: product feature
attribute: length
value: ball gown
source: product title