Find the Missing Element

You are given two lists of integers. The first list, arr, represents the complete set of elements, while the second list, brr, contains all but one of these elements. Your task is to find the missing element by subtracting the sum of brr from the sum of arr.

In other words, if \( S_{arr} \) is the sum of the complete list and \( S_{brr} \) is the sum of the incomplete list, then the missing element is given by:

[ \text{missing} = S_{arr} - S_{brr} ]

It is guaranteed that exactly one element is missing and each list has at least two integers.

inputFormat

The input is given in three lines:

1. An integer \( n \) representing the number of elements in the complete list arr.
2. \( n \) space-separated integers representing the complete list arr.
3. \( n-1 \) space-separated integers representing the list brr with one element missing.

outputFormat

Output a single integer, which is the missing element from the list brr.

## sample

4
1 2 3 4
1 2 4

3

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