Solve the programming task below in a Python markdown code block.
You are given a string, and you have to validate whether it's a valid Roman numeral. If it is valid, print True. Otherwise, print False. Try to create a regular expression for a valid Roman numeral.

Input Format

A single line of input containing a string of Roman characters.

Output Format

Output a single line containing True or False according to the instructions above.

Constraints

The number will be between $\mbox{I}$ and $\textbf{3999}$ (both included).

Sample Input

CDXXI

Sample Output

True

References  

Regular expressions are a key concept in any programming language. A quick explanation with Python examples is available here. You could also go through the link below to read more about regular expressions in Python.  

https://developers.google.com/edu/python/regular-expressions