diff --git a/course_contents/21_algorithms_data_structures/projects/samples/stack.py b/course_contents/21_algorithms_data_structures/projects/samples/stack.py
index e496dc1..4192238 100644
--- a/course_contents/21_algorithms_data_structures/projects/samples/stack.py
+++ b/course_contents/21_algorithms_data_structures/projects/samples/stack.py
@@ -3,10 +3,10 @@ def __init__(self):
         self.items = []
     
     def push(self, e):
-        self.items.append(e)
+        self.items = [e] + self.items
     
     def pop(self):
-        return self.items.pop()
+        return self.items.pop(0)
 
 
 s = Stack()