diff --git a/Ukoly/DU_9/class.py b/Ukoly/DU_9/class.py
new file mode 100644
index 0000000..1afaa2f
--- /dev/null
+++ b/Ukoly/DU_9/class.py
@@ -0,0 +1,64 @@
+class band_member:
+    def __init__(self, name):
+        self.name = name
+
+    def play(self):
+        print(f'{self.name} plays on {self.instrument}')
+
+
+class guitarist(band_member):
+    def play(self, number_of_strings):
+        self.number_of_strings = number_of_strings
+        if self.number_of_strings >= 4 and self.number_of_strings < 6:
+            self.instrument = 'bass guitar'
+        elif self.number_of_strings >= 6:
+            self.instrument = 'solo guitar'
+        super().play()
+
+
+class singer(band_member):
+    def play(self):
+        print(f'{self.name} sings')
+
+
+class drummer(band_member):
+    instrument = 'drums'
+
+    def __init__(self, name):
+        self.number_of_sticks = 2
+        super().__init__(name)
+
+    def throw_a_stick(self):
+        self.number_of_sticks += 1
+
+    def number_of_throwen_sticks(self):
+        if self.throw_a_stick():
+            self.number_of_sticks += 2
+        print(f'{self.name} allready threw {self.number_of_sticks} into the crowd.')
+
+
+Tom = singer('Tom')
+
+Jan = guitarist('Jan')
+Jan.number_of_strings = 4
+
+Vojta = guitarist('Vojta')
+Vojta.number_of_strings = 7
+
+Filip = guitarist('Filip')
+Filip.number_of_strings = 6
+
+Martin = drummer('Martin')
+for _ in range(3):
+    Martin.throw_a_stick()
+Martin.number_of_throwen_sticks()
+
+
+guitarists = [Jan, Vojta, Filip]
+members = [Martin, Tom]
+
+for guitarist in guitarists:
+    guitarist.play(guitarist.number_of_strings)
+
+for member in members:
+    member.play()