diff --git a/set_theory_find_unique_elements.py b/set_theory_find_unique_elements.py
index 78744fc..003f79e 100644
--- a/set_theory_find_unique_elements.py
+++ b/set_theory_find_unique_elements.py
@@ -5,17 +5,11 @@
 appeared = {}
 
 for i in range (len(arr)):
-    # Do something here
-    '''
-    Hint:
-    Use a dictionary to store the counts of the elements
-    Example: appeared[9] = 2
-    '''
+    if arr[i] in appeared:
+        appeared[arr[i]] += 1
+    else:
+        appeared[arr[i]] = 1
 
 for i in appeared:
-    # Do something here
-    '''
-    Hint:
-    How do you check if something is unique?
-    What will appeared[i] equals to?
-    '''
+    if appeared[i] == 1:
+        print(i, end=" ")
\ No newline at end of file
diff --git a/t13_mean1.py b/t13_mean1.py
index 842f670..b8c0bc9 100644
--- a/t13_mean1.py
+++ b/t13_mean1.py
@@ -1,11 +1,8 @@
 # Find the mean of n numbers
 
-n = int(input("Enter number of numbers: "))
-numbers = []
-total = 0
-for i in range(n):
-  numbers.append(float(input("Enter number: ")))
-for number in numbers:
-  total = total + number
-print(numbers)
-print(total / n)
+n = int(input("Enter an integer number of numbers: ")) 
+
+numbers = [float(input("Enter number: ")) for i in range(n)]
+
+print(f"List of numbers: {numbers}\nMean of the numbers: {sum(numbers)/ n}") # print the list of numbers and the mean
+