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