Time Limit: 2 Seconds
Memory Limit: 65536 KB
Whoooa! There is a spy in Marjar University. All we know is that the spy has a special ID card. Please find him out!
There are multiple test cases. The first line of input contains an integer T indicating the number of test cases. For each test case:
The first line contains a integer N (3 <= N <= 100), which describes that there are N students need to be checked.
The second line contains N integers indicating the ID card number of N students. All ID card numbers are 32-bit integers.