Thanks for the help!

Consider the complex numbers in the picture below:

Let $S$ be the set of all complex numbers $z$ satisfying $|w+z| = |w| + |z|$
for the complex number $w$ above. Which of the complex numbers in the list $s, t, u, v, w$
are in set $S$? Answer in any order you like, separating the list by commas.