#include<stdio.h>
int main()
{
   int n;
   scanf("%d", &n);
   if (n < 0)
   {
       printf("Invalid input");
       return 0;
   }
   int arr[n], result[n];
   int i, j, k = 0;
   int isduplicate;
   for (i = 0; i < n;i++)
   {
   scanf("%d", &arr[i])
   {
    for(i = 0; i < n; i++)
    {
        isduplicate = 0;
        for (j = 0; j < k; j++)
    {
        if (arr[i] == result[j])
        {
            isduplicate = 1;
            break;
        }
    }
    if (! isduplicate)
    {
        result[k++] = arr[i];
    }
   }
   for (int i = 0; i < k; i++)
   {
      printf("%d", result[i]);
   }
   return 0; 
}