#include<bits/stdc++.h>
#define optimize() ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)
#define ll long long
#define endl '\n'
using namespace std;
int main()
{
    optimize();
    int n,c=0;
    cin>>n;
    vector<ll>v(n);
    map<ll,ll>m;
    vector<ll>v1;
    for(auto &u:v)
    {
        cin>>u;
        m[u]++;
    }
    for(auto u:m)
    {
        if(u.second==1)v1.push_back(u.first);
    }
    for(auto u:v1)cout<<u<<" ";
    cout<<endl;


}