The skeleton counter

A dictionary holds the parts of the axial skeleton, with the number of bones in each part, as NCERT gives them. You will add the parts, and then sort the ribs.

The idea. A human has 12 pairs of ribs. Pairs 1 to 7 are true ribs, pairs 8 to 10 are false ribs, and pairs 11 and 12 are floating ribs.

Your tasks.

1. Finish total_bones. It adds the numbers in a dictionary.
2. Finish rib_kind. It gives "true", "false" or "floating" for a pair of ribs from 1 to 12.
3. Finish ribs_not_on_sternum. It gives the number of ribs, on both sides, that do not reach the sternum directly.