uses crt;
var n,i,j,tam:longint;a:array[1..100000]of longint;
begin
 clrscr;
  readln(n);
  for i:=1 to n do readln(a[i]);
  for i:=1 to n-1 do
   for j:=i+1 to n do
    if(a[i]>a[j])then
        begin
         tam:=a[i];
         a[i]:=a[j];
         a[j]:=tam;
        end;
  for i:=1 to n do if(a[i]<>a[i+1])and(a[i]<>a[i-1])then write(a[i]);
 readln;
end.

#include <iostream>
using namespace std;
long arr_count(long a[],long n,long k){
    long count=0;
    for (long i=0; i<n; i++) if (a[i]==k) count++;
    return count;
}
int main(){
    long n;
    cin >> n;
    long a[n],b[n],m=0;
    for (long i=0; i<n; i++) cin >> a[i];
    for (long i=0; i<n; i++){
        if (arr_count(a,n,a[i])==1) cout << a[i] << " ";
    }
}

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