Instruction: Given the title, description, feature, price, and brand of a product and a set of target attributes, extract the value of each target attribute from the product information. Output the extracted value and the corresponding source (e.g., title or feature) denoting where the value is extracted.

Input:
Product title: Oscar Schmidt Delta King Semi Hollow BlueBurst Guitar w/ Hard Case, OE30FBLB
Product description: Features: Classic Semi-Hollow Body Style Mahogany Double Cutaway Maple Bolt-On Neck Rosewood Fingerboard Tune-O-Matic Bridge with Stop Tailpiece 2 Volume and 2 Tone Controls 3-Way Pickup Selector Gold Die Cast Tuners 2 Humbucker Pickups Overall Length: 40.5 Lower Bout: 16.5 Depth: 2 Scale Length: 24-3/4 Nut Width: 1-11/16 Color: Blue Burst Model: OE30FBLB
Product feature: Oscar Schmidt Semi Hollow Body 335 Style Electric Guitar, Body: Top, Back, & Sides Maple Neck: Mahogany Fret Board: Rosewood, Pickups: 2 Humbucker Pickups Controls: 3 Way Switch, 2 Tone, 2 Volume 22 Frets, Tuners: Gold Grover Tuners 18-1 Gear Ratio Bridge: Tune-O-Matic Style Bridge with Stop Tail Peice Bolt on Neck, Bundle Includes: Hard Case
Product brand: Oscar Schmidt
Target attributes: Number of Strings
Answer: attribute: number of strings
value: None
source: None