What have you tried? What worked? See How do I post a question effectively?. Questions such as this should be posted as independent questions/new threads since they are not pertinent to the immediate conversation.
If you post your code that reads in your CSV, I can help you sort it. Without that info, your question is ill-defined.
#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.