Correct

放马后炮

/ fàng mǎhòupào / 
Strokes

Definition

to fire after the horse has bolted (idiom); to act too late to be effective

Example

As a Verb

hindsight; second-guess

1
Tā
他
lǎo
老
ài
爱
fàngmǎhòupào
放马后炮
  
。

He is always a second-guesser.