Consider the following code snippet. If num$\_$a is $24$ and num$\_$b is $72,$ then the output will be $\_\_\_\_\_.$

num$\_$a $=$ int$($input$(\text{'}$Enter first positive integer:

$\text{'}))$

num$\_$b $=$ int$($input$(\text{'}$Enter second positive integer:

$\text{'}))$

while num$\_$a $!=$ num$\_$b:

if num$\_$b $>$ num$\_$a:

num$\_$b $=$ num$\_$b $-$ num$\_$a

else:

num$\_$a $=$ num$\_$a $-$ num$\_$b

print$(\text{'}$GCD is $\%$d$\text{'}\%$ num$\_$a$)$