How to use "BOOST" in SF2442

Puzzles
#1

I am a newcomer and playing SF2442.
From the instruction, the output format is “A single line: 2 integers for the target coordinates of your drone followed by thrust, the acceleration to give your drone or the keyword BOOST.”

So, I add the BOOST in ouput directly, then i get one error “error: cannot find symbol”:
System.out.println(Math.round(checkPoint.x) + " " +Math.round(checkPoint.y) + " " + BOOST);

So, i try to define a value to BOOST, but the power is less than 100.
I have no idea about this, could you help tell me how to use “BOOST” in the code?
Thank you very much~

#2

I know the answer now.
Just print " BOOST", i thought it is a constant.