18. Write a method called vertical that accepts a string as its parameter and prints each letter of the string on sepa- rate lines. For example, a call of vertical ("hey now") should produce the following output: h e y D o 19. Write a method called printReverse that accepts a string as its parameter and prints the characters in opposite order. For example, a call of printReverse ("hello there!") should print "! ereht olleh". If the empty string is passed, the method should produce no output. 20. Write a method called inputBirthday that accepts a Scanner for the console as a parameter and prompts the user to enter a month, day, and year of birth, then prints the birthdate in a suitable format. Here is an example dia- logue with the user: On what day of the month were you born? 8 What is the name of the month in which you were born? May During what year were you born? 1981 You were born on May 8, 1981. You're mighty old!