diff --git a/16.9.py b/16.9.py
new file mode 100644
index 0000000..ea83b97
--- /dev/null
+++ b/16.9.py
@@ -0,0 +1,34 @@
+class Iterator:
+
+    def __init__(self, data, indicator):
+        self.data = data.copy()
+        self.indicator = indicator
+        
+
+    def __iter__(self):
+        return self
+    
+    def __next__(self):
+        if self.indicator == 'increase':
+            if not self.data:
+                raise StopIteration
+            el = min(self.data)
+            self.data.remove(el)
+            return el
+        elif self.indicator == 'decrease':
+            if not self.data:
+                raise StopIteration
+            el = max(self.data)
+            self.data.remove(el)
+            return el
+        
+if __name__ == '__main__':
+    seq = [4, 7, 1, 8, 2, 3, 4, 0, 9]
+    seq_iter = Iterator(seq, 'increase')
+    for i in seq_iter:
+        print(i)
+
+    seq_iter = Iterator(seq, 'decrease')
+    for i in seq_iter:
+        print(i)
+