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+# IO
+
+Bruijn supports a variant of John Tromp's monadic IO[^1].
+
+Every program's `main`{.bruijn} function has an additional abstraction
+that gets applied with a lazy list of input bytes. These bytes are
+encoded as the syntactic sugar encoding of binary numbers, which can be
+manipulated with [`std/Number/Binary`](/std/Number_Binary.bruijn.html).
+
+You can use [`std/Monad`](/std/Monad.bruijn.html) to interact with the
+input monadically, or simply use [`std/List`](/std/List.bruijn.html)
+operations to work with the input as a normal list.
+
+## Example
+
+``` bruijn
+:import std/List .
+
+# reverse the input list
+main [<~>0]
+```
+
+``` bash
+$ printf "tacocat" | bruijn reverse.bruijn
+tacocat
+```
+
+[^1]: [Tromp, John. "Functional Bits: Lambda Calculus based Algorithmic
+    Information Theory." (2023).](https://tromp.github.io/cl/LC.pdf)