end2:	SUBX	6,i
	DECO	lvec,sxf
	RET0

Enter this code in the location where you find Max and Min. you'll know where

Also, Try starting with subing 2, 4, 6, 8, 10 Extra.
lets say you enter 1 2 3 4 5 -999
sub 2 will show 5.
Sub 4 will show 4
Sub 6 will show 3.
Sub 8 will show 2.
Sub 10 will show 1