diff --git a/2021/d23/ex1/input b/2021/d23/ex1/input
new file mode 100644
index 0000000..9b8c8e7
--- /dev/null
+++ b/2021/d23/ex1/input
@@ -0,0 +1,5 @@
+#############
+#...........#
+###C#B#A#D###
+  #C#D#A#B#
+  #########