Advice for adding a search box to WP page

I want to add a search box on a single wp page. When someone enters a number, it needs to display an answer pertaining to the number that I predefined.
What is the best way to do this
Is there any plugin to do this

I am not familiar with codings

I googled it but couldn't find a better solution.
It will be a great help if anyone gives an answer.

You may do this with a form not with a search box.

Use Gravity Forms for this for example. You could simply create a conditional input, the input can receive text values, and it may be searchable (for example a list input with advanced user interface, search box)

Check an example here.

Then if the user lets say puts in the box: "1", then you may do another text field in the bottom, that conditionally puts the text you want according to the input from the list field.

For example: If text-field is = 1 then show "This content"

You don't need to code, but you need a little tweaking and tinkering with Gravity Forms to make it work. But this is the overall idea.