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: Generic YCUS150720-167 <8&1161*1> k Blackth Guitar C With Guitar Case New Beginners Strap, Tuner and Pick Black Acoustic Guitar Strap, Tuner and Pick Black New Beginne
Product description: Description This Beautiful Acoustic Guitar Is A Functional Acoustic Guitar, Which Is Perfect For Beginners. Youll Be Playing Your Favorite Tunes With Practice And Dedication. Good Quality And Beautiful Surface Make It A Best Choice For You. It Is Lightweight And Easy To Carry. High Desity And Hard Texture Rosewood Is Good For Long Lifetime Of The Guitar And Turning Machine. It Has A Comfortable Touch Feel And Easy To Sound. With Fashionable Design, Reasonable Price And Excellent Quality, It's The Best Welcome Gift.. Feature Brand New And Good Quality.Higher Performance Cost Ratio With Better Tones And Feels Classical Guitar:Music Instrument, Wooden Guitar,Fashion Design And Easily CarryStable Quality, Beautiful Sound,Rose Fingerboard And Bridge Makes Sound More Wonderful Precision Tuners, Shoulder Strap 38 Inch Big Acoustic Guitar Kit Painting Surface: Polished Sturdy Carrying Case Shoulder Strap Perfect For Beginners Diecast Machine Specifications Color: Black Materials (Top, Back And Side): Wood String Material: Steel Dimension: 38" Machine Heads: Chrome Diecast Body Style: Standard Classical Product Includes: 1*Acoustic Guitar 1*Guitar Bag 1*Shoulder Straps 1*Guitar Pick 1 Set For String 1* TunerFingerboard And Bridge Makes Sound More Wonderful Precision Tuners, Shoulder Strap 38 Inch Big Acoustic Guitar Kit Painting Surface: Polished Sturdy Carrying Case Shoulder Strap Perfect For Beginners Diecast Machine
Product feature: This Beautiful Acoustic Guitar Is A Functional Acoustic Guitar, Which Is Perfect For Beginners, Good Quality And Beautiful Surface Make It A Best Choice For You, High Desity And Hard Texture Rosewood Is Good For Long Lifetime Of The Guitar And Turning Machine., Perfect For Beginners, Free & Fast Shipping(US Stock)
Product brand: Generic
Target attributes: Number of Strings
Answer: attribute: number of strings
value: None
source: None