4) Write BNF rules that matches only a string that is in the form of a capitalized title (as in a book or movie titles). Such titles may be made up of one or more words (letters only), separated by single spaces (no leading or trailing spaces). Each word must begin with a capital letter and the rest of the letters must be lowercase. For example, these are legal titles: Jaws, No Country For Old Men. On the other hand, these titles would not be legal: ET, 500 Days Of Summer, in bruge, Lethal weapon. Using the No Country For Old Men input, show the parse tree of your grammar. (15 pts]