Define a function FindPrice$()$ that takes one integer parameter as the person's age traveling by train, and returns the ticket price as an integer. The price is returned as follows:

If a person's age is less than $4$ or more than $84,$ price is $$7.$

If a person's age is between $17$ and $63,$ inclusive, price is $$25.$

Otherwise, price is $$18.$

Ex: If the input is $3,$ then the output is:

$7$