diff --git a/input_test/03.txt b/input_test/03.txt
new file mode 100644
index 0000000..b20187f
--- /dev/null
+++ b/input_test/03.txt
@@ -0,0 +1,10 @@
+467..114..
+...*......
+..35..633.
+......#...
+617*......
+.....+.58.
+..592.....
+......755.
+...$.*....
+.664.598..
diff --git a/main.clj b/main.clj
index fbfcd6a..4b879a5 100644
--- a/main.clj
+++ b/main.clj
@@ -2,7 +2,8 @@
   "Advent Of Code 2023 solved in Clojure"
   (:require
    [day01]
-   [day02])
+   [day02]
+   [day03])
   (:import
    [java.time Instant Duration]))
 
@@ -20,6 +21,8 @@
   (benchmark day01/part2 "01" "2")
   (benchmark day02/part1 "02" "1")
   (benchmark day02/part2 "02" "2")
+  (benchmark day03/part1 "03" "1")
+  (benchmark day03/part2 "03" "2")
   (println "\nthe end."))
 
 (aoc-23)
diff --git a/src/day03.clj b/src/day03.clj
new file mode 100644
index 0000000..e302c8c
--- /dev/null
+++ b/src/day03.clj
@@ -0,0 +1,89 @@
+(ns day03
+  "Day 02 funtions"
+  (:require
+   [utils]
+   [clojure.string :as str]))
+
+(def contents ":: String" (utils/read-file "03" true))
+(def lines ":: Vec of String" (str/split-lines contents))
+
+(defn is-digit?
+  ":: Char -> Bool"
+  [c]
+  (if (nil? c)
+    false
+    (let [cn (int c)]
+      (and (>= cn 48) (<= cn 57)))))
+
+; :start is the start column number, :end is the end. 0-based
+; Element :: {:value String :start Int :end Int}
+;
+; Index :: {Int Vec of Element} where Int is the row number
+
+(defn process
+  ":: ?String, Int, Vec of Element, Vec of Char, Int -> Vec of Element
+  :: Vec of Char -> Vec of Element
+  "
+  ([acc-str acc-pos acc-vector next-list pos]
+   (if (empty? next-list)
+     ; base case, return the vector of elements
+     ; TODO: append to vec if there is a last acc present
+     acc-vector
+     ; recurse
+     (let [c (first next-list)
+           c-is-digit (is-digit? c)
+           acc-exists (not (nil? acc-str))
+           next-pos (inc pos)
+           next-list (rest next-list)]
+       ;
+       (cond
+         ; append to accumulator and continue
+         (and c-is-digit acc-exists) (process (str acc-str c)
+                                              acc-pos
+                                              acc-vector
+                                              next-list
+                                              next-pos)
+         ; create new accumulator string and pos
+         (and c-is-digit (not acc-exists)) (process (str c)
+                                                    pos
+                                                    acc-vector
+                                                    next-list
+                                                    next-pos)
+         ; add the current acc to the vec, reset acc
+         (and (not c-is-digit) acc-exists) (process nil
+                                                    -1
+                                                    (conj acc-vector {:value acc-str :start acc-pos :end pos})
+                                                    next-list
+                                                    next-pos)
+         ; continue
+         (and (not c-is-digit) (not acc-exists)) (process acc-str acc-pos acc-vector next-list next-pos)))))
+
+  ([next-list] (process nil -1 [] next-list 0)))
+
+(defn parse-elements
+  ":: String -> Vec of Element"
+  [line]
+
+  "")
+
+(defn parse-lines
+  "
+  :: Vec of String -> {:numbers Vec of Element :symbols Vec of element}
+
+  Creates 2 maps from the input: A map of numbers and a map of symbols.
+  Each map stores a row number and elements. Each element stores its
+  column numbers.
+  "
+  []
+  "")
+
+(defn part1
+  ":: () -> String"
+  []
+  "")
+
+(defn part2
+  ":: () -> String"
+  []
+  "")
+