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Error

Given two integers A and B. Your task is to return their product.

**Example 1:**

**Input:**
A = 1, B = 2
**Output:**
2
**Explanation:**
Multiplication of 1 and 2 is 2.

**Example 2:**

**Input:**
A = 8, B = 7
**Output:**
56
**Explanation:**
Multiplication of 8 and 7 is 56.

**Your Task:**

You don't need to read input or print anything. Your task is to complete the function multiplication() which takes two integers a and b and returns their product.

**Expected Time Complexity:** O(1)

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

**Constraints:**

0<=a,b<=10000

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