diff --git a/Tsu.Trees.RedGreen/sample/Class1.cs b/Tsu.Trees.RedGreen/sample/Class1.cs
deleted file mode 100644
index 1786265..0000000
--- a/Tsu.Trees.RedGreen/sample/Class1.cs
+++ /dev/null
@@ -1,6 +0,0 @@
-namespace Tsu.Trees.RedGreen.Sample;
-
-public class Class1
-{
-
-}
diff --git a/Tsu.Trees.RedGreen/sample/Program.cs b/Tsu.Trees.RedGreen/sample/Program.cs
new file mode 100644
index 0000000..89bccb5
--- /dev/null
+++ b/Tsu.Trees.RedGreen/sample/Program.cs
@@ -0,0 +1 @@
+Console.WriteLine("Hello world.");
\ No newline at end of file