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Given two singly linked lists of size N and M, write a program to get the point where two linked lists intersect each other.

Y ShapedLinked List
Above diagram shows an example with two linked list having 15 as intersection point.

Example 1:

LinkList1 = {10,20,5,10}
LinkList2 = {30,40,50,5,10}
Output: 5
Explanation:The point of intersection of
two linked list is 5, means both of them
get linked (intersects) with each other
at node whose value is 5.

Your Task:
The task is to complete the function intersetPoint() which finds the point of intersection of two linked list. The function should return data value of a node where two linked lists merge. If linked list do not merge at any point, then it should return -1.

Challenge : Try to solve the problem without using any extra space.

Expected Time Complexity: O(N+M)
Expected Auxiliary Space: O(1)

1 <= N <= 100
1 <= value <= 1000


** For More Input/Output Examples Use 'Expected Output' option **

Contributor: Amit Khandelwal
Author: kartik

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