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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
The problem is that you seem to make a substitution by finding the first character. In your case it is M; CM = 900. You need to refine the algorithm so that the longest possible combination of several characters is found first.
First find CM, change it to 900, then find M and change it to 1000. The result sum is 1900.