Number of Turns in Binary Tree

Given a binary tree and data value of two of its nodes. Find the number of turns needed to reach from one node to another in the given binary tree.

Example 1:

Input:      
Tree = 
           1
        /    \
       2       3
     /  \     /  \
    4    5   6    7                        
   /        / \                        
  8        9   10   
first node = 5
second node = 10
Output: 4
Explanation: 
Turns will be at 2, 1, 3, 6.

Example 2:

Input:      
Tree = 
           1
        /     \
       2        3
     /  \      /  \
    4    5    6    7                        
   /         / \                        
  8         9   10   
first node = 1
second node = 4  
Output: -1
Explanation: No turn is required since 
they are in a straight line.

Your Task:  
You don't need to read input or print anything. Complete the function NumberOFTurns() which takes root node and data value of 2 nodes as input parameters and returns the number of turns required to navigate between them. If the two nodes are in a straight line, ie- the path does not involve any turns, return -1.

Expected Time Complexity: O(N)
Expected Auxiliary Space: O(Height of Tree)

Constraints:
1 ≤ N ≤ 103