Find Last Digit Of a^b for Large Numbers
Easy Accuracy: 15.33% Submissions: 267 Points: 2

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

 

Example 1:

Input:
a = "3", b = "10"
Output:
9
Explanation:
310 = 59049. Last digit is 9.

Example 2:

Input:
a = "6", b = "2"
Output:
6
Explanation:
62 = 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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