Of course it is -5!
Supplement:
When you see log on the calculator, press log-100, and the result is 2.
Therefore, on the calculator, the log is based on 10, which is basically considered by the international community!
But lg is also a logarithm based on 10.
The logarithm of any base is also expressed by log, but don't forget to enter the base on the calculator.
A few more tugs and you'll understand.