Print all unique elements (those that occur exactly once).

Difficulty: Hard

Phase: 4 · Basic Arrays

XP Reward: 30 XP

Topics: Basic Arrays, Hard

Supported Languages: Python, JavaScript, C, C++, Java

Problem Description

Given N followed by N integers, print all unique elements (occurring exactly once) in ascending order separated by space. Input Format: Read input from standard input (stdin). Output Format: Print the result to standard output (stdout).

Constraints

-10^9 <= N <= 10^9

Examples

Example 1

Input: 5 1 2 2 3 4

Output: 1 3 4

Explanation: Sample execution for input 5 1 2 2 3 4