Given two numbers represented by two different arrays A and B. The task is to find the sum array. The sum array is an array representation of addition of two input arrays.

Example 1:

Input:
N = 3, M = 3
A[] = {5, 6, 3}
B[] = {8, 4, 2}
Output: 1 4 0 5
Explanation: As 563 + 842 = 1405.

Your Task:
You don't need to read input or print anything. Your task is to complete the function findSum() which takes the array(vector) of integers a and b as parameters and returns an array denoting the answer.

Expected Time Complexity: O(max(N, M)) Expected Auxiliary Space: O(1)

Constraints:
1 ≤ N ≤ M ≤ 10^{6}
0 ≤ A_{i}, B_{i }≤ 9
No leading zeroes in array A and B.