// editor1
#include <stdio.h>
 
int main() {
    int n;
    scanf("%d", &n);
    
    if (n <= 0 || n > 10) {
        printf(" Invalid input\n");
        return 0;
    }
    
    int arr;
    for (int i =0; i < n; i++) {
        scanf("%d", &arr[i]);
    }
    
    for (int i = 0; i < n; i++) {
        int isDuplicate = 0;
        for (int j = 0; j < i; j++) {
            if (arr[i] == arr[j]) {
                isDuplicate = 1;
                break;
            }
        }
        if (!isDuplicate) {
            printf("%d", arr[i]);
        }
    }
    printf("\n");
    return 0;
}