Sum of Big Integers

Given two positive integers X and Y. You have to add two integers and output their sum.

 

Example 1:

Input:
X = 3, Y = 4
Output:
7
Explanation:
Sum of X and Y is 7

 

Example 2:

Input:
X = 8, Y = 2 
Output:
10
Explanation:
Sum of X and Y is 10.

 

Your Task:
Your task is to complete the function add() which accepts BigIntegers x and y as input parameters, and returns their sum.

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