How many times does Loop $1$ iterate on input lists A $=(2,7,11,16,21)$ and B $=(3,4,6,9,13)?$ For all lists, items are removed from the front and added to the back. The front of the list is one the left and the back is on the right, so $2$ is at the front of list A and $21$ is at the back of list A $.$

$//$ Loop $1$:

While$($ size$($A$)>0$ AND size$($B$)>0)$

If $($ front$($A$)<$ front$($B$)),$ then x :$=$ remove$($A$)$

If $($ front$($A$)$ front$($B$)),$ then x :$=$ remove$($B$)$

add$($x$,$ C$)$

End$-$while

a$.$

$5$

b$.$

$7$

c$.$

$8$

d$.$

$10$

a$.$

$24,13,18,24$

b$.$

$24,13,18$

c$.$

$24,18,24$

d$.$

$24,13,18,18$