# define your list
my_list = [1, 2, 3, 2, 4, 5, 3, 6]

# create empty list to store duplicates
duplicates = []

# loop through each item and check its count
for item in my_list:
    if my_list.count(item) > 1 and item not in duplicates:
        duplicates.append(item)

# print duplicates if they are present
if len(duplicates) != 0:
    print("Duplicates:", duplicates)
else:
    print('No duplicates found!')