THIS IS THE FORMAT. NOT THE QUESTION. USE THIS FORMAT TO ANSWER THE QUESTION IN THE PHOTO.

NOT the question, the FORMAT. DO NOT ANSWER THIS TEXT, USE THIS EXAMPLE TO FORMAT YOUR ANSWER TO THE PHOTO BELOW.

Trace

a: $1,2,3$

b: $1,2,3$

c: $1,2,3$

Output

$1$

$2$

$3$

$4$

USE THIS FORMAT FOR YOUR ANSWER PLEASE. ANSWER THE QUESTION IN THE PHOTO BELOW.