diff --git a/AdventOfCode2025/Inputs/Input.cs b/AdventOfCode2025/Inputs/Input.cs
index 0250124..18f7252 100644
--- a/AdventOfCode2025/Inputs/Input.cs
+++ b/AdventOfCode2025/Inputs/Input.cs
@@ -3,13 +3,6 @@ namespace AdventOfCode2025.Inputs;
 public sealed record Input(int Day, int PartNumber = 1)
 {
     private const string BasePath = "../../../Inputs/";
-    public string ToPath()  => BasePath + $"Day{Day}_{PartNumber}.txt";
-}
-
-public static class InputExtensions
-{
-    extension(Input input)
-    {
-        public IEnumerable<string> Lines => File.ReadAllLines(input.ToPath());
-    }
+    private string ToPath()  => BasePath + $"Day{Day}_{PartNumber}.txt";
+    public IEnumerable<string> Lines => field ??= File.ReadAllLines(ToPath());
 }
\ No newline at end of file