//***************************************************************
//*????????????                                     *
//*?  ?????                                               *
//*?????2010.10.29.                                        *
//*?????????????                                   *
//***************************************************************
int main ()
{
	int i, n;                          //i?????????????n????????
	cin>>n;
	int a[20000] = {0};                //????????20000????????0
	for ( i = 0; i < n; i ++ )
	{
		cin>>a[i];                     //????????
	}
	cout<<a[0];                        //???????

	int k, m;                          //??????k,m
	for ( k = 1; k < n; k ++ )
	{
		for ( m = 0; m < k; m ++ )     //???????????????
		{
			if ( a[k] != a[m] )
				continue;
			else
				break;
		}
		if ( m == k && a[k] != a[k-1] )    //??????????????????????
			cout<<" "<<a[k];               //??????? 
	}
	return 0;
}
