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: AXL Headliner Series Electric Guitar, 1/2-Sized, Red
Product description: Available in full, 3/4 or 1/2 size, the AXL Headliner SRO (AS-750) electric guitar is a budding guitarists perfect axe, featuring a solid alder body, three single coil pickups, maple neck and tremolo bridge. The Headliner SRO has met the demand for a quality guitar that is also available in fractional sizes. Full-size SRO models are available in black, white, sunburst and red finishes. Fractional sizes are available in black, metallic blue and metallic red. The Headliner is also available in a left-handed version (AS-754)
Product feature: Basswood Body, Maple Neck, 3 Single Coil Pickups, 5-Way Selector Switch, Rosewood Fretboard
Product brand: AXL
Target attributes: Number of Strings
Answer: attribute: number of strings
value: None
source: None