14.12 (Searching Strings) Complete this assignment as written as a Java console application (a) use a regular expression and the String.matches() method to validate that all tokens from the String.split() method are alphabetic characters (display an error message for invalid input).

(Searching Strings) Write an application based on the application in Exercise 14.11 that inputs a line of text and uses String method indexOf to determine the total number of occurrences of each letter of the alphabet in the text. Uppercase and lowercase letters should be counted together. Store the totals for each letter in an array, and print the values in tabular format after the totals have been determined