Description

Input

The input consists of multiple test cases. The first line contains an integer $t$ ($1 \leq t \leq 1000$) — the number of test cases. The description of the test cases follows.

The first line of each test case contains an integer $n$ ($2 \leq n \leq 100$) — the number of integers in the resulting array $a$.

The second line of each test case contains $n$ integers $a_1, a_2, \ldots, a_n$ ($0 \le a_i \le 127$) — the elements of the newly formed array $a$.

Additional constraint on the input: the array $a$ is made by the process described in the statement; that is, some value of $x$ exists.

Output

For each test case, output a single integer — the value of $x$, as described in the statement. If there are multiple possible values of $x$, output any of them.

Samples

4
4
4 3 2 5
5
6 1 10 7 10
6
6 6 6 6 6 6
3
100 100 0

3
7
6
0

Note

In the first test case, one possible array $a$ is $a=[2, 5, 4]$. Then $x = 2 \oplus 5 \oplus 4 = 3$ ($\oplus$ denotes the bitwise XOR), so the new array is $[2, 5, 4, 3]$. Afterwards, the array is shuffled to form $[4, 3, 2, 5]$.

In the second test case, one possible array $a$ is $a=[1, 10, 6, 10]$. Then $x = 1 \oplus 10 \oplus 6 \oplus 10 = 7$, so the new array is $[1, 10, 6, 10, 7]$. Afterwards, the array is shuffled to form $[6, 1, 10, 7, 10]$.

In the third test case, all elements of the array are equal to $6$, so $x=6$.

In the fourth test case, one possible array $a$ is $a=[100, 100]$. Then $x = 100 \oplus 100 = 0$, so the new array is $[100, 100, 0]$. Afterwards, the array is shuffled to form $[100, 100, 0]$. (Note that after the shuffle, the array can remain the same.)