A word is said to be “abecedarian” if the letters in the word
appear in alphabetical order. For example, the following are all
six-letter English abecedarian words:
abdest, acknow, acorsy, adempt, adipsy, agnosy, befist,
behint,
beknow, bijoux, biopsy, cestuy, chintz, deflux, dehors,
dehort,
deinos, diluvy, dimpsy
Write a method called isAbecedarian that takes a String and
returns a boolean indicating whether the word is abecedarian.