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# Greatest Common Divisor

Problem Description

Given 2 non-negative integers A and B, find gcd(A, B).
GCD of 2 integers m and n is defined as the greatest integer g such that g is a divisor of both m and n.
Both A and B fit in a 32-bit signed integer.
NOTE: DO NOT USE LIBRARY FUNCTIONS

Problem Constraints
0 <= A <= 109
0 <= B <= 109

Input Format
The first argument is an integer A.
The second argument is an integer B.

Output Format
Return the Greatest Common Divisor of A and B

Example Input
Input 1:
```A = 6
B = 9```

Example Output
Output 1:
`3`

Example Explanation
Explanation 1:
`3 is the GCD of 6 and 9`

NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a question? Checkout Sample Codes for more details.
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## Discussion

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