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Given three numbers **a**, **b** and **m**. The task is to find (a^b)%m.

**Note: **a is given as a String because it can be very big.

**Example 1:**

Input:a ="3",b =2,m =4Output:1Explanation:(3^2)%4 = 9%4 = 1

**Example 2:**

Input:a ="8",b =2,m =6Output:4Explanation:(8^2)%6 = 64%6 = 4

**Your Task:**

You don't need to read input or print anything. Your task is to complete the function **powerMod()** which takes a string a and 2 integers b, and m as input and returns (a^{b} % m).

**Expected Time Complexity:** O(Number of digits in a)

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

**Constraints:**

1 <= |a| <= 10^{5}

0 <= b <= 10^{9}

1 <= m <=10^{9}

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Find (a^b)%m

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