Given a sequence of strings, the task is to find out the second most repeated (or frequent) string in the given sequence.
Note: No two strings are the second most repeated, there will be always a single string.
The first line of input contains an integer T denoting the number of test cases. Then T test cases follow. Each test case consists of two lines. First line of each test case contains an Integer N denoting number of strings in a sequence and the second line contains N space separated strings.
Output: For each test case, in a new line print the second most repeated string.