First constructed linked list is : 12 . 35 . 1 . 10 . 34 . 1
first = push ( first , 1 ) ; first = push ( first , 34 ) ; first = push ( first , 10 ) ; first = push ( first , 1 ) ; first = push ( first , 35 ) ; first = push ( first , 12 ) ; var second = null ;