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Given two integers a and b. Find the sum of two numbers** without using arithmetic operators**.

**Example 1:**

**Input:
**a = 5, b = 3
**Output:** 8
**Explanation :**
5 + 3 = 8

**Example 2:**

**Input:**
a = 10, b = 30
**Output:** 40
**Explanation:**
10 + 30 = 40

You don't need to read input or print anything. Your task is to complete the function sum() which takes two integers a and b as input and returns the sum of a and b, which is calculated without using any arithmetic operator.

1<=a, b<=10^8

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Sum of two numbers without using arithmetic operators

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