Print a node at distance k from root

Given a root of a tree, and an integer k. Print all the nodes which are at k distance from root.
For example, in the below tree, 4, 5 & 8 are at distance 2 from root.
          /   \
        2      3
      /  \    /
    4     5  8


  1. Will try to solve it.

    However you did not say anything about this following solutions (Gussa hone ki Emoticon hogi)

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