diff --git a/input/2023/1.txt b/input/2023/1.txt
new file mode 100644
index 0000000..239b44b
--- /dev/null
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\ No newline at end of file
diff --git a/src/aoc_2023/day_1.gleam b/src/aoc_2023/day_1.gleam
new file mode 100644
index 0000000..fd4e958
--- /dev/null
+++ b/src/aoc_2023/day_1.gleam
@@ -0,0 +1,81 @@
+import gleam/string
+import gleam/list
+import gleam/result
+import gleam/int
+import gleam/pair
+import gleam/function
+
+fn is_digit(s) {
+  case s {
+    "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" -> True
+    _ -> False
+  }
+}
+
+fn digits_to_calibration(l: List(String)) -> Int {
+  case l {
+    [] -> panic as "each line must contain at least one digit"
+    [x] -> {
+      let assert Ok(digit) = int.parse(x)
+      11 * digit
+    }
+    [first, ..] -> {
+      let assert Ok(first) = int.parse(first)
+
+      let assert Ok(last) =
+        l
+        |> list.last
+        |> result.try(int.parse)
+
+      first * 10 + last
+    }
+  }
+}
+
+fn process_line(line: String) {
+  line
+  |> string.to_graphemes
+  |> list.partition(is_digit)
+  |> pair.map_first(digits_to_calibration)
+}
+
+fn process(input: String, pre_process: fn(String) -> String) {
+  input
+  |> string.split("\n")
+  |> list.map(pre_process)
+  |> list.map(process_line)
+  |> list.map(pair.first)
+  |> int.sum
+}
+
+pub fn pt_1(input: String) {
+  process(input, function.identity)
+}
+
+pub fn pt_2(input: String) {
+  process(input, pre_process(_, []))
+}
+
+fn pre_process(graphemes: String, acc: List(String)) -> String {
+  case graphemes {
+    "zero" <> _ -> pre_process(string.drop_left(graphemes, 1), ["0", ..acc])
+    "one" <> _ -> pre_process(string.drop_left(graphemes, 1), ["1", ..acc])
+    "two" <> _ -> pre_process(string.drop_left(graphemes, 1), ["2", ..acc])
+    "three" <> _ -> pre_process(string.drop_left(graphemes, 1), ["3", ..acc])
+    "four" <> _ -> pre_process(string.drop_left(graphemes, 1), ["4", ..acc])
+    "five" <> _ -> pre_process(string.drop_left(graphemes, 1), ["5", ..acc])
+    "six" <> _ -> pre_process(string.drop_left(graphemes, 1), ["6", ..acc])
+    "seven" <> _ -> pre_process(string.drop_left(graphemes, 1), ["7", ..acc])
+    "eight" <> _ -> pre_process(string.drop_left(graphemes, 1), ["8", ..acc])
+    "nine" <> _ -> pre_process(string.drop_left(graphemes, 1), ["9", ..acc])
+    "" ->
+      acc
+      |> list.reverse
+      |> string.concat
+
+    _ -> {
+      let assert Ok(first) = string.first(graphemes)
+      pre_process(string.drop_left(graphemes, 1), [first, ..acc])
+    }
+  }
+}