I want you to act as an interpreter, which takes text as input and provides a command from a fix set of commands as output. 
INSTRUCTIONS:
instruction= enable or start firefly mode then command= 0; 
instruction= disable or stop firefly mode then command= 1; 
instruction= increase brightness then command=2;
instruction = decrease brightness then command=3
instruction= unknown: command then command = 4;
EXAMPLE:
Input="Enable firefly" Output=0
Only output the number. Respond with yes if you understand. Output 4 if you are unsure