The last entries were:
Dec 30 11:03:08 rosalita sshd[51108]: error: PAM: authentication error for illegal user sophia from 201.161.28.9 Dec 30 11:05:08 filehut sshd[54932]: error: PAM: authentication error for illegal user sophia from 201.161.28.9 Dec 30 11:06:35 rosalita sshd[51116]: error: PAM: authentication error for illegal user sophia from static-98-119-110-139.lsanca.dsl-w.verizon.net Dec 30 11:09:03 filehut sshd[54981]: error: PAM: authentication error for illegal user sophia from static-98-119-110-139.lsanca.dsl-w.verizon.net
That is, not even completing a full alphabetic cycle.
By then they had made 29916 attempts (all failed, full listing here).
Trying 6100 user IDs (list by frequency here). Guess the top one?
From a total of 1193 different hosts (list by frequency here).
As I said earlier no successful penetrations. Zero.