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use strict;
use warnings;
...
CDXLVI         .D..XVI
MCMXCVI        M.C.XVI
MDCLI          MDCL..I

  Input =>  Expect  (    LtoR : ok?) (    RroL : ok? )
    ---        ---        ---   ---        ---   ---  
...
 CDXLVI => .D..XVI  ( ..C.XVI : Not) ( .D.L.VI : Not )
MCMXCVI => M.C.XVI  ( M.C.XVI : Ok ) ( M.C..VI : Not )
  MDCLI => MDCL..I  ( MDCL..I : Ok ) ( MDCL..I : Ok  )