In a galaxy named Kalpana, there are N stars. Scientists are categorizing these stars on the basis of their characteristics. They have divided these N stars into 26 groups named from A to Z. Also, a given star is given some integer between range $[1, 26]$. So, if a star belongs to group A, integer associated with it will be 1, 2 for B and so on upto 26 for Z.

There is one group with odd number of stars. Your task is to print that particular group.

Input Format:

First line contains T, number of test cases.

First line of each test case contains N, number of stars.

Second line of each test case contains N values denoting the integers associated with each star.

Output Format:

For each test case, output the required answer is separate lines.

Constraints:

$1 \leq T \leq 10$

$1 \leq N \leq 10^5$

$1 \leq$ intger associated with each star $\leq 26$