def find_duplicates(numbers):
	seen = set()
	duplicates = []
	
	for number in numbers:
		if number in seen and number not in duplicates:
			duplicates.append(number)
		else:
			seen.add(number)
	return duplicates
	
numbers = []

result = find_duplicates(numbers)

print("Input:", numbers)
print("Duplicates:", result)