#include <stdio.h>
int main() {
    int n;
    scanf("%d", &n);
    
    if (n < 0) {
        printf("Invalid input");
        return 0;
    }
    int arr[n];
    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]);
        }
    }
    
    return 0;
}