[Python] Compare 2 lists

Hello,

I'm new to the python programming, and I have a question.
I have to write a program that prints a receipt for a restaurant. The input is a list which looks like:

product1
product3
product8
....

In the other input file there is a list which looks like:

product1 coffee 5,00
product2 bread 7,50
....

So I need to compare the first list to the second and print the receipt with prices and a total price.

It doesn't look that hard but I just don't know how or where to start. Can somebody help me?

Thank you

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