Replace Node With Depth

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Given a a binary tree. Replace each of it's data with the depth of tree.

Root is at depth 0, change its value to 0 and next level nodes are at depth 1 and so on.

Example:

Input

Alt text

Output

Alt text

Input format :
Line 1 :  Elements in level order form (separated by space)
(If any node does not have left or right child, take -1 in its place)
Output Format :
 Inorder traversal of modified tree.
Sample Input 1:
     1 2 3 4 5 6 7 -1 -1 -1 -1 -1 -1 -1 -1
Sample Output 1:
     2 
     1
     2
     0 
     2 
     1
     2

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