What is the relationship between Walter Energy and coal in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

Walter Energy Inc. (WLTGQ), with its restructuring deal in pieces, pleaded with a reluctant bankruptcy judge Thursday for a new cash order that would appease its lenders and grant the coal company 30 days to reset.

Answer: product_or_material_produced