diff --git a/u8/program.py b/u8/program.py
index 605db0e..6755e19 100644
--- a/u8/program.py
+++ b/u8/program.py
@@ -106,3 +106,7 @@ class ZooExpertSystem:
             return False
 
         return True
+
+if __name__ == "__main__":
+    system = ZooExpertSystem()
+    system.run()