Let $z$ and $w$ be complex numbers such that $|z| = 2$ and $|w| = 5.$  Find the smallest possible value of $|w - z|.$
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Let $z$ and $w$ be complex numbers such that $|z| = 2$ and $|w| = 5.$  Find the smallest possible value of $|w - z|.$
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
3
Let $z$ and $w$ be complex numbers such that $|z| = 2$ and $|w| = 5.$  Find the smallest possible value of $|w - z|.$
train