diff --git a/src/tutorial/class/storage.py b/src/tutorial/class/storage.py
new file mode 100644
index 0000000..a6859db
--- /dev/null
+++ b/src/tutorial/class/storage.py
@@ -0,0 +1,27 @@
+from abc import ABC, abstractmethod
+
+
+class Storage(ABC):
+    @abstractmethod
+    def save(self, key: str, value: str) -> None:
+        pass
+
+    @abstractmethod
+    def load(self, key: str) -> str:
+        pass
+
+
+class MemoryStorage(Storage):
+    def __init__(self) -> None:
+        self.storage = {}
+
+    def save(self, key: str, value: str) -> None:
+        self.storage[key] = value
+
+    def load(self, key):
+        return self.storage[key]
+
+
+s = MemoryStorage()
+s.save("randomkey", "My Value")
+print(s.load("randomkey"))