Generate a Python program that has the following intention:

The intention of the program is to find the greatest common divisor (GCD) of two numbers using the Euclidean algorithm.

The Euclidean algorithm is a mathematical method for finding the greatest common divisor (GCD) of two numbers. The basic idea is to keep dividing the two numbers until one of them becomes zero, and then the other number is the GCD.

The program implements the Euclidean algorithm using a recursive function named p1. The function takes two numbers, a and b, as input. If b is zero, the function returns a immediately, as a is the GCD of a and 0. Otherwise, the function calls itself recursively with a and b divided by the GCD of a and b (which is b in the previous step). This process continues until b becomes zero, at which point the function returns the GCD of the two numbers.

In summary, the program implements the Euclidean algorithm to find the GCD of two numbers using recursion. Write your response with at least 1000 words.
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