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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