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Given two numbers **a** and **b**. Find the last digit of a raised to the power b.

**Example 1:**

Input:a = 3 b = 4Output:1Explanation:3^{4}= 81 so the last digit is 1.

**Example 2:**

Input:a = 2 b = 8Output:6Explanation:2^{8}= 256 so the last digit is 6.

**Your Task: **

You don't need to read input or print anything. Your task is to complete the function **quickExponents()** which take two integers a and b and returns the last digit of a raise to the power b.

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

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

**Constraints:**

1 <= a, b <= 10^{18}

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Quick Exponents

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