URI Online Judge | 2290
# Apaixornados Numbers

**Timelimit: 2**

By Francisco Elio Parente Arcos Filho, UEA Brazil

You will be given an array of **N** numbers, where everyone will be in pairs. But two of those numbers ended up without peer, these numbers are said apaixornados numbers, you can identify what are that numbers?

For example, **A** = {1, 1, 3, 3, 5, 5, 5,7}, the apaixornados numbers are 5 and 7.

The input consists of several test cases. Each test case is composed of a line having an integer **N** (1 ≤ **N** ≤ 10^{5}), followed by **N** numbers (-10^{12} < **A** < 10^{12}). The input ends when **N** = 0 and it should not to be processed.

For each test case print only the apaixornados numbers in ascending order. It is guaranteed that only two numbers are alone.

Input Sample | Output Sample |

6 |
4 7 |