Climbing send log

Summarise a climber's logbook: the hardest send and the number of sends in each grading system.

Each entry of log is a string "<grade> <result>". A gym has two grading systems, and grades are only ever compared within their own system:

• Rope routes use 5.5 up to 5.9, then 5.10a, 5.10b, 5.10c, 5.10d, 5.11a, and so on up to 5.15d. Grades from 5.10 up always carry a letter a to d; lower grades never do. A higher number is harder, and for the same number a later letter is harder. So 5.10a is harder than 5.9.
• Boulder problems use VB (the easiest), then V0, V1, up to V17. A larger number is harder, so V10 is harder than V2.

The result is one of send, flash, onsight (all three count as a send), or fell, bailed (not a send). Only sends count towards the hardest grade and the send count. The same grade may be logged many times and every send counts.

Input: log, a list of strings such as "5.10a send" or "V4 fell".

Output: a list [routeHardest, routeSends, boulderHardest, boulderSends]. A hardest grade is the exact grade text from the log, or "-" when that system has no sends (its send count is then 0).