how do I define this function to get this output?

$[8,2,3,4,5,6,7,7,9,4]$

This is what I have so far

exlist $=[]$

x$=[8,-2,3,-4,5,-6,7,-7,9,-4]$

for num in x:

if num $>0$:

exlist.append$($num$)$

else:

add$=$num$*-1$

exlist.append$($add$)$

print$($exlist$)$