Write a program that reads in a line of text and replaces all four-letter words with the w...

Write a program that reads in a line of text and replaces all four-letter words with the word "love". For example, the input string

should produce the following output:

Of course, the output will not always make sense. For example, the input string

should produce the following output:

If the four-letter word starts with a capital letter, it should be replaced by "Love", not by "love". You need not check capitalization, except for the first letter of a word. A word is any string consisting of the letters of the alphabet and delimited at each end by a blank, the end of the line, or any other character that is not a letter. Your program should repeat this action until the user says to quit.