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You are given two integer numbers, the base a and the index b. You have to find the last digit of a^{b}.

**Example 1:**

Input:a ="3",b = "10"Output:9Explanation:3^{10}= 59049. Last digit is 9.

**Example 2:**

Input:a ="6",b = "2"Output:6Explanation:6^{2}= 36. Last digit is 6.

**Your Task:**

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

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

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

**Constraints:**

1 <= |a|,|b| <= 1000

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Find Last Digit Of a^b for Large Numbers

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