diff --git a/minstack.py b/minstack.py
new file mode 100644
index 00000000..ceff993d
--- /dev/null
+++ b/minstack.py
@@ -0,0 +1,33 @@
+class MinStack:
+
+    def __init__(self):
+        self.a =[]
+        self.b=[]
+        
+
+    def push(self, val: int) -> None:
+        self.a.append(val)
+        if len(self.b) == 0 or val <= self.b[-1]:
+            self.b.append(val)
+        
+    def pop(self) -> None:
+        if len(self.a) >0:
+            if self.a[-1] == self.b[-1]:
+                self.b.pop()
+            self.a.pop()
+        
+    def top(self) -> int:
+        return self.a[-1]
+        
+
+    def getMin(self) -> int:
+        return self.b[-1]
+        
+
+
+# Your MinStack object will be instantiated and called as such:
+# obj = MinStack()
+# obj.push(val)
+# obj.pop()
+# param_3 = obj.top()
+# param_4 = obj.getMin()