Reverse LL (Iterative)

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Given a linked list, reverse it iteratively.

You don't need to print the elements, just reverse the LL duplicates and return the head of updated LL.

Input format : Linked list elements (separated by space and terminated by -1)`

Sample Input 1 :
1 2 3 4 5 -1
Sample Output 1 :
5 4 3 2 1

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