Missing number

There is a permutation without two numbers in it, and now you know what numbers the permutation has. Please find the two numbers it lose.

There is a number \(T\) shows there are \(T\) test cases below. ($T \leq 10$)
For each test case , the first line contains a integers \(n\) , which means the number of numbers the permutation has. In following a line , there are $n$ distinct postive integers.($1 \leq n \leq 1,000$)

For each case output two numbers , small number first.

2
3
3 4 5
1
1

1 2
2 3

BestCoder Round #28