**Common Elements**

**Problem Description**

Given two integer array **A** and **B** of size **N** and **M** respectively. Your task is to find all the **common elements** in both the array.

**NOTE:**

- Each element in the result should appear as many times as it shows in both arrays.
- The result can be in any order.

**Problem Constraints**

1 <= N, M <= 105

1 <= A[i] <= 109

**Input Format**

First argument is an integer array A of size N.

Second argument is an integer array B of size M.

**Output Format**

Return an integer array denoting the common elements.

**Example Input**

**Input 1:**

A = [1, 2, 2, 1] B = [2, 3, 1, 2]

**Input 2:**

A = [2, 1, 4, 10] B = [3, 6, 2, 10, 10]

**Example Output**

**Output 1:**

[1, 2, 2]

**Output 2:**

[2, 10]

**Example Explanation**

**Explanation 1:**

Elements (1, 2, 2) appears in both the array. Note 2 appears twice in both the array.

**Explanation 2:**

Elements (2, 10) appears in both the array.