There is no linear search in there, either explicit via a loop, or implicit via library code.
Start by going back to your assignment and reading it carefully - generally the instructions are pretty explicit as to what exactly is required of you. Then read your notes from the last lecture (or two) in the light of your new understanding of the task and you should have a good idea what to do.
If you have tried to search but it "has errors" then show use exactly what the code you tried was, and explain what it did that you didn't expect, or didn't do that you did. Show us any error messages, and where they occur. Explain how you got them to happen, and what you have tried to do to fix them.
While we are more than willing to help those that are stuck, that doesn't mean that we are here to do it all for you! We can't do all the work, you are either getting paid for this, or it's part of your grades and it wouldn't be at all fair for us to do it all for you.
So we need you to do the work, and we will help you when you get stuck. That doesn't mean we will give you a step by step solution you can hand in!
Start by explaining where you are at the moment, and what the next step in the process is. Then tell us what you have tried to get that next step working, and what happened when you did.
If you are having problems getting started at all, then this may help:
How to Write Code to Solve a Problem, A Beginner's Guide[
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