11.22. Exercise: Roman numbers

Write functions that return true if the given value is a Roman Number.
If you can do that maybe write another function to return the decimal
value of the given number.
I, II, III, IV, V, VI, VII,....
   I = 1
   V = 5
   X = 10
   L = 50
   C = 100
   D = 500
   M = 1000


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