Implement a python script for factorial of number by using recursion.

Implement a python script for factorial of number by using recursion.

# Function to calculate factorial using recursion
def factorial(n):
    if n == 0 or n == 1:
        return 1
    else:
        return n * factorial(n - 1)

# Main Program
num = int(input("Enter a number: "))

if num < 0:
    print("Factorial does not exist for negative numbers.")
else:
    print("Factorial of", num, "is:", factorial(num))