In this challenge, we will check if a string contains consecutive letters as they appear in the English alphabet and if each letter occurs only once.
Rules are: (1) the letters are adjacent in the English alphabet, and (2) each letter occurs only once.
solve("abc") = True, because it contains a,b,c
solve("abd") = False, because a, b, d are not consecutive/adjacent in the alphabet, and c is missing.
solve("dabc") = True, because it contains a, b, c, d
solve("abbc") = False, because b does not occur once.
solve("v") = True
All inputs will be lowercase letters.
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