The pollination sorter

A list of events says where the pollen came from. You will write the code that names each kind of pollination and counts the events that bring genetically new pollen.

The idea. The kind of pollination depends only on the source of the pollen.

Your tasks.

1. Finish kind. It takes the source, which is "same flower", "same plant" or "other plant", and gives the kind.
2. Finish brings_new_genes. It gives True only for xenogamy.
3. Finish count_new. It counts the events in a list that bring genetically new pollen.