is it a roman numeral by rotary-o

using C=System.Console;class M{static void Main(){for(;;)C.WriteLine(System.Text.RegularExpressions.Regex.IsMatch(C.ReadLine(),"^M*(D?C{0,3}|C[DM])(L?X{0,3}|X.)(V?I{0,3}|I[VX])$")?1:0);}}

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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