insert Nodes in the circular linked list
head = None NEW_LINE head = insertNode ( head , 1 ) NEW_LINE head = insertNode ( head , 2 ) NEW_LINE head = insertNode ( head , 3 ) NEW_LINE head = insertNode ( head , 4 ) NEW_LINE head = insertNode ( head , 5 ) NEW_LINE head = insertNode ( head , 6 ) NEW_LINE head = insertNode ( head , 7 ) NEW_LINE head = insertNode ( head , 8 ) NEW_LINE head = insertNode ( head , 9 ) NEW_LINE k = 4 NEW_LINE