Помощь с программой Python для поиска дубликатов элементов

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Code-
list = []

num=int(input('how many numbers'))
for n in range(num):
    number=int(input('enter numbers'))
    list.append(number)
print(list)
list.sort()

newlist=list
for n in range(len(newlist)):
    if newlist[n]==newlist[n+1]:
         print("dupilcate found at index"+str(int(newlist.index(n))))
         break
        
    else:
        print('no duplicates')

Что я уже пробовал:

its running but not giving results.My logic is to first just sort the list then check if any number is equal to its neighbouring number in the sorted list,because equal numbers would be neighbours in sorted list.

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