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Given a number and its reverse. Find that number raised to the power of its own reverse.

**Note:** As answers can be very large, print the result modulo **10 ^{9} + 7**.

**Example 1:**

**Input:
**N = 2
**Output: **4**
Explanation: **The reverse of 2 is 2
and after raising power of 2 by 2
we get 4 which gives remainder as
4 by dividing 1000000007.

**Example 2:**

**Input:
**N = 12
**Output: **864354781**
Explanation: **The reverse of 12 is 21
and 12^{21 }, when divided by 1000000007
gives remainder as 864354781.

**Your Task:**

You don't need to read input or print anything. You just need to complete the **function pow() **that takes two parameters **N and R** denoting the input number and its reverse and returns **power **of (N to R)mod(**10 ^{9} + 7**).

**Expected Time Complexity: **O(LogN).

**Expected Auxiliary Space: **O(LogN).

**Constraints:**

1 <= N <= 10^{9}

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Power Of Numbers

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