Write a function that returns the greatest common divisor (GCD) of integers in a list. Use the following function header: def gcd(numbers): Write a test program that prompts the user to enter five...

Write a function that returns the greatest common divisor (GCD) of integers in a list. Use the following function header:
def gcd(numbers):
Write a test program that prompts the user to enter five numbers, invokes the function to find the GCD of these numbers, and displays the GCD.