First, thank you for your kindly answer for my last question. I checked the site you provided for paying the immigration fee. It said that these two number can be found on immigrant data summary, USCIS Immigrant Fee handout, or immigrant visa stamp.
I could not find the A number and DOS number from the documents that Embassy gave, but i found two number on the visa page of the passport: IV case number and Registration number. Are they the DOS number and A number?
Thank you!