Our company exports a lot of goods to Japan by CIF Tokyo. On April 20, an irrevocable lett

er of credit at sight was opened by the Bank of Tokyo, Japan. The amount of the L/C is US$50,000 and the shipment date is May. It is also stipulated in the L/C that the Bank of China at the place of seller is the advising bank and the negotiating bank. After receiving the L/C, the Bank of China notified the exporting company on April 22. But on April 30, before goods will shipped, our export company learned that Japanese importers were on the verge of bankruptcy due to financial problems. Q: What should we do in this case （）