diff --git a/aoc/src/dev/ctsk/aoc/Main.scala b/aoc/src/dev/ctsk/aoc/Main.scala
index da3c996..3d471e3 100644
--- a/aoc/src/dev/ctsk/aoc/Main.scala
+++ b/aoc/src/dev/ctsk/aoc/Main.scala
@@ -26,10 +26,10 @@ def runSolver(solver: Solver, input: os.Path): Unit =
   day match
     case "all" =>
       solvers.foreach { case (day, solver) =>
-        runSolver(solver, os.pwd / os.RelPath(input) / f"$day%02d.in")
+        runSolver(solver, os.Path(input, os.pwd) / f"$day%02d.in")
       }
     case num(_) =>
       solvers.get(day.toInt) match
-        case Some(solver) => runSolver(solver, os.pwd / os.RelPath(input))
+        case Some(solver) => runSolver(solver, os.Path(input, os.pwd))
         case None         => println(s"Day $day not solved")
     case _ => println(day)
diff --git a/aoc/src/dev/ctsk/aoc/Solution.scala b/aoc/src/dev/ctsk/aoc/Solution.scala
index 2f4e869..5b09596 100644
--- a/aoc/src/dev/ctsk/aoc/Solution.scala
+++ b/aoc/src/dev/ctsk/aoc/Solution.scala
@@ -5,7 +5,7 @@ case class Timings(prep: Long, p1: Long, p2: Long)
 case class Solution(p1: Object, p2: Object)
 
 abstract class Solver(day: Int):
-  def run(input: os.Path): (Timings, Solution)
+  def run(input: os.ReadablePath): (Timings, Solution)
 
   def timed[A](solution: => A): (Long, A) =
     val start = System.nanoTime()
diff --git a/aoc/src/dev/ctsk/aoc/Util.scala b/aoc/src/dev/ctsk/aoc/Util.scala
new file mode 100644
index 0000000..b55286e
--- /dev/null
+++ b/aoc/src/dev/ctsk/aoc/Util.scala
@@ -0,0 +1,12 @@
+package dev.ctsk.aoc
+
+import scala.collection
+
+val NAT_REGEX = """(\d+)""".r
+val INT_REGEX = """-?(\d+)""".r
+
+def naturals(string: CharSequence): Vector[Long] =
+  NAT_REGEX.findAllIn(string).map(_.toLong).toVector
+
+def integers(string: CharSequence): Vector[Long] =
+  INT_REGEX.findAllIn(string).map(_.toLong).toVector
\ No newline at end of file
diff --git a/aoc/src/dev/ctsk/aoc/days/Day01.scala b/aoc/src/dev/ctsk/aoc/days/Day01.scala
index 92641a8..1383d7e 100644
--- a/aoc/src/dev/ctsk/aoc/days/Day01.scala
+++ b/aoc/src/dev/ctsk/aoc/days/Day01.scala
@@ -5,7 +5,7 @@ import dev.ctsk.aoc._
 object Day01 extends Solver(1):
   type Input = (Array[Int], Array[Int])
 
-  def pre(input: os.Path): Input =
+  def pre(input: os.ReadablePath): Input =
     os.read
       .lines(input)
       .map { case s"$i   $j" => (i.toInt, j.toInt) }
@@ -21,7 +21,7 @@ object Day01 extends Solver(1):
     val counts = right.groupMapReduce(identity)(identity)(_ + _)
     left.map(n => counts.getOrElse(n, 0)).sum
 
-  def run(input: os.Path): (Timings, Solution) =
+  def run(input: os.ReadablePath): (Timings, Solution) =
     val (pre_time, pre_input) = timed { pre(input) }
     val (p1_time, p1_solution) = timed { part1(pre_input) }
     val (p2_time, p2_solution) = timed { part2(pre_input) }
diff --git a/aoc/src/dev/ctsk/aoc/days/Day02.scala b/aoc/src/dev/ctsk/aoc/days/Day02.scala
index 9fca9d5..5aecb20 100644
--- a/aoc/src/dev/ctsk/aoc/days/Day02.scala
+++ b/aoc/src/dev/ctsk/aoc/days/Day02.scala
@@ -3,7 +3,7 @@ package dev.ctsk.aoc.days
 import dev.ctsk.aoc._
 
 object Day02 extends Solver(2):
-  def pre(input: os.Path): List[List[Int]] =
+  def pre(input: os.ReadablePath): List[List[Int]] =
     os.read
       .lines(input)
       .map(line => line.split(" ").map(_.toInt).toList)
@@ -24,7 +24,7 @@ object Day02 extends Solver(2):
   def part2(lists: List[List[Int]]): Int =
     lists.count(list => safeWithGap(list) || safeWithGap(list.reverse))
 
-  def run(input: os.Path): (Timings, Solution) =
+  def run(input: os.ReadablePath): (Timings, Solution) =
     val (pre_time, pre_input) = timed { pre(input) }
     val (p1_time, p1_solution) = timed { part1(pre_input) }
     val (p2_time, p2_solution) = timed { part2(pre_input) }
diff --git a/aoc/src/dev/ctsk/aoc/days/Day03.scala b/aoc/src/dev/ctsk/aoc/days/Day03.scala
index 9ead0ba..814fbe9 100644
--- a/aoc/src/dev/ctsk/aoc/days/Day03.scala
+++ b/aoc/src/dev/ctsk/aoc/days/Day03.scala
@@ -24,7 +24,7 @@ object Day03 extends Solver(3):
       }
       ._2
 
-  def run(input: os.Path): (Timings, Solution) =
+  def run(input: os.ReadablePath): (Timings, Solution) =
     val in = os.read(input)
     val (p1_time, p1_solution) = timed { part1(in) }
     val (p2_time, p2_solution) = timed { part2(in) }
diff --git a/aoc/src/dev/ctsk/aoc/days/Day04.scala b/aoc/src/dev/ctsk/aoc/days/Day04.scala
index 395bbee..6089ccc 100644
--- a/aoc/src/dev/ctsk/aoc/days/Day04.scala
+++ b/aoc/src/dev/ctsk/aoc/days/Day04.scala
@@ -38,7 +38,7 @@ object Day04 extends Solver(4):
         && grid(i - 1)(j + 1) + grid(i + 1)(j - 1) == 'S' + 'M'
     yield ()).length
 
-  def run(input: os.Path): (Timings, Solution) =
+  def run(input: os.ReadablePath): (Timings, Solution) =
     var in = os.read.lines(input).map { line => line.toVector }.toVector
 
     val (p1_time, p1_solution) = timed { part1(in) }
diff --git a/aoc/src/dev/ctsk/aoc/days/Day05.scala b/aoc/src/dev/ctsk/aoc/days/Day05.scala
index efea7a3..90b1f4a 100644
--- a/aoc/src/dev/ctsk/aoc/days/Day05.scala
+++ b/aoc/src/dev/ctsk/aoc/days/Day05.scala
@@ -4,7 +4,7 @@ import dev.ctsk.aoc._
 import scala.annotation.nowarn
 
 object Day05 extends Solver(5):
-  def pre(input: os.Path) =
+  def pre(input: os.ReadablePath) =
     val Array(rulesStr, updatesStr) = os.read(input).split("\n\n")
 
     val rules = rulesStr.linesIterator
@@ -19,7 +19,7 @@ object Day05 extends Solver(5):
 
     (rules, updates)
 
-  def run(input: os.Path): (Timings, Solution) =
+  def run(input: os.ReadablePath): (Timings, Solution) =
     val (pre_time, (rules, updates)) = timed { pre(input) }
 
     @nowarn("msg=match may not be exhaustive")