Street fortune teller, how can you know your last name without asking?

He first asks you to find out which page your surname is on (he will say you don't have to tell him which word it is), which is about 10 (there are many surnames on each page), and then asks you to find out which cell your surname is in on another big piece of paper (there are about 10 cells, each cell is marked with numbers and each cell has several surnames), and he asks you to tell him where it is. Then he will tell you your last name. First of all, the surnames on ten small pieces of paper are special, such as "Huang", which starts with H. The surnames on the same piece of paper will no longer start with H. "Huang" is the only one on this piece of paper that starts with H. Arrange the ten pieces of paper like this. The ten squares on that big piece of paper are also arranged regularly, but unlike ten small pieces of paper, don't be afraid of not arranging enough surnames! So all he has to do is look at the paper you choose and the two same surnames in the small box on the big paper, which are your surnames.