diff --git a/homeworks/09_Elena_Varbanova/09_Elena_Varbanova:01_check_circles.py b/homeworks/09_Elena_Varbanova/01_check_circles.py
similarity index 100%
rename from homeworks/09_Elena_Varbanova/09_Elena_Varbanova:01_check_circles.py
rename to homeworks/09_Elena_Varbanova/01_check_circles.py
diff --git a/homeworks/09_Elena_Varbanova/replace.py b/homeworks/09_Elena_Varbanova/replace.py
new file mode 100644
index 0000000..de4ff53
--- /dev/null
+++ b/homeworks/09_Elena_Varbanova/replace.py
@@ -0,0 +1,38 @@
+def replace(listing, finding, replacing):
+	counter = 0
+
+	for index in listing:
+
+		if type(index) != int and len(index) > 1:
+
+			if type(index) == tuple:
+				new_list = list(listing[counter])
+				new_list = replace(new_list, finding, replacing)
+				listing[counter] = tuple(new_list)
+			
+			else:
+				new_list = listing[counter]
+				new_list = replace(new_list, finding, replacing)
+
+		if index == finding:
+			listing[counter] = replacing
+
+		counter = counter + 1 
+
+	return listing
+
+listing = [ 'a', 1, [ ['a', 'b'], 1], ([1, 3, 'a'], 'a')]#last 'a' in English
+res = replace(listing, 'a', 'c')
+print(res)#[ 'c', 1, [ ['c', 'b'], 1], ([1, 3, 'c'], 'b')]
+
+print("...........")
+
+list1 = [ 'a', 1, [ ['a', 'b'], 1], ([1, 3, 'a'], 'а')]#last 'a' in Bulgarian
+res1 = replace(list1, 'a', 'c')
+print(res1)#[ 2, 'e', [ ['a', 'b'], 'c'], (['e', 3, 2], 'a')]
+
+print("...........")
+
+list2 = [ 2, 1, [ ['a', 'b'], 'c'], ([1, 3, 2], 1)]
+res2 = replace(list2, 1, 'e')
+print(res2)#[ 2, 'e', [ ['a', 'b'], 'c'], (['e', 3, 2], 'b')]
diff --git a/homeworks/09_Elena_Varbanova/step_counter.py b/homeworks/09_Elena_Varbanova/step_counter.py
new file mode 100644
index 0000000..4310251
--- /dev/null
+++ b/homeworks/09_Elena_Varbanova/step_counter.py
@@ -0,0 +1,18 @@
+def fibonacci(number):
+	if number <= 1:
+		return number
+	return fibonacci(number - 1) + fibonacci(number - 2)
+
+
+def num_ways(num):
+	return fibonacci(num + 1)
+
+
+stair1 = 2
+print("Number of ways:", num_ways(stair1))
+
+stair2 = 3
+print("Number of ways:", num_ways(stair2))
+
+stair3 = 4
+print("Number of ways:", num_ways(stair3))