Instruction: Using the product's title, description, features, price, and brand, identify and retrieve the values associated with a specified set of target attributes. Output the extracted values along with their respective sources (e.g., title or feature) indicating where each value was found.

Input:
Product title: Zenker Mini Muffins Pan
Product description: Z6541 Features: -Muffin pan.-Non stick pan.-Smaller portions.-24 Mini muffins.-15.19" H x 10.5" W x 0.44" D, 1.2 lbs. Collection: -Zenker collection.
Product feature: kitchen, Frieling
Product brand: Frieling
Target attributes: Shape
Answer: attribute: shape
value: None
source: None