#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;
}