
int main()
{
    int i, j, n, a[300], flag[300] = {0};
    int last;

    scanf("%d", &n);
    for (i=0; i<n; i++)
        scanf("%d", &a[i]);

    for (i=0; i<n-1; i++)
        for (j=i+1; j<n; j++) 
            if (flag[j] == 0 && a[i] == a[j])
                flag[j] = 1;

    for (i=n-1; i>=0; i--)
        if (flag[i] == 0) {
            last = i;
            break;
        }
    for (i=0; i<last; i++)
        if (flag[i] == 0)
            printf("%d,", a[i]);
    printf("%d", a[last]);

    return 0;
}

