#include <stdio.h>
 int main() {
     int n;
     scanf("%d", &n);
     if (n < 0){
         printf("Invalid input");
         return 0;
     }
 }
 int arr[20]; //array size (safe limit since n <= 10)
 for(int i = 0; i < n; i++){
     scanf("%d", &arr[i]);
 }
 for(int i = 0; i < n; i++){
     int duplicate = 0;
     for (int j = 0; j < i; j++) {
         if (arr[i] == arr[j]) {
             duplicate = 1;
             break;
         }
     }
    if (!duplicate) {
         printf("%d", arr[i]); //print with space
    }
 }
 return 0;
    
}