Fill in the draft according to the following requirements and write the answer to the following horizontal line:The following is the front and back of a commercial bill which subordinated to a letter of credit , Please according to the contents of the bill:1. Indicating the role of the parties involved in the trade(Importer,Exporter,Advising bank,Issuing bank);2. According to the endorsement on the back of the draft to explain the transfer of the draft process.