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For two given positive numbers a and b. Find a^{b}. Output your number modulus 10^{9}+7.

**Example 1:**

**Input: **a = 1, b = 1
**Output:** 1
**Explanation**: 1^{1} % (10^{9}+7) = 1

â€‹**Example 2:**

**Input**: a = 2, b = 5
**Output:** 32
**Explanation**: 2^{5} % (10^{9}+7) = 32

**Your Task: **

You don't need to read input or print anything. Your task is to complete the function **power()** which takes **a, b **as inputs, and returns the answer.

**Expected Time Complexity:** O(log b)

**Expected Auxiliary Space:** O(1)

**Constraints:**

1 ≤ a ≤ 10^{5}

1 ≤ b ≤ 10^{16}

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Exponentiation (Set 2)

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