int main()
{
    int size,itr;
    char num;
    scanf("%d",&size);
    if(size<0)
    {
        printf("Invalid input");
        return 0;
    }
    getchar();
    for(itr=1;itr<=size*2;itr++)
    {
        scanf("%c",&num);
        if(num == ' ')
            continue;
        root=insert(root,num);
    }
    inOrder(root);
    return 0;
}