Find Repeating Elements

You are given an array of n integers. Your task is to find all the elements in the array that appear more than once and then output these elements in ascending order.

For example, given an array arr, you need to compute:

$$\{x \mid x \in arr \text{ and the frequency of } x > 1\}$$

If no element repeats, output an empty line.

Examples:

• Input: 8\n4 3 2 7 8 2 3 1 → Output: 2 3
• Input: 5\n1 2 3 4 5 → Output: (empty output)

inputFormat

The first line contains an integer n, representing the number of elements in the array. The second line contains n space-separated integers which form the array.

outputFormat

Output the repeating elements in ascending order, separated by spaces. If there are no repeating elements, output an empty line.

8
4 3 2 7 8 2 3 1

2 3