diff --git a/one/.prettierrc b/one/.prettierrc
new file mode 100644
index 0000000..d68aa73
--- /dev/null
+++ b/one/.prettierrc
@@ -0,0 +1,3 @@
+{
+  "arrowParens": "avoid"
+}
diff --git a/one/one.js b/one/one.js
new file mode 100644
index 0000000..22e6393
--- /dev/null
+++ b/one/one.js
@@ -0,0 +1,13 @@
+import fs from "node:fs";
+
+let data = fs.readFileSync("input", "utf8");
+
+let lines = data
+  .split("\n")
+  .map(l => l.split("").filter(c => +c == c))
+  .map(l => [l[0], l[l.length - 1]])
+  .map(l => l.join(""))
+  .map(n => Number(n))
+  .reduce((acc, n) => acc + n);
+
+console.log(lines);
diff --git a/one/package.json b/one/package.json
new file mode 100644
index 0000000..5666488
--- /dev/null
+++ b/one/package.json
@@ -0,0 +1,12 @@
+{
+  "name": "one",
+  "version": "1.0.0",
+  "description": "",
+  "main": "one.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "type": "module"
+}