Describe all bijective analytic maps from punctured unit disk to itself

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Let $\mathbb{D}$ be the unit disk and let $A=\mathbb{D}$-{$a,b,c$} where $a,b,c\in\mathbb{D}$. How can I describe all conformal automorphism or in other words bijective analytic functions $f:A\to A$? I feel like I should use the Riemann mapping theorem but I am not too sure how to. Any help is appreciated.