Write a Python program to implement the simple flow chart that prompts the user for positive integers Or a negative integer to calculate the average and terminate. Upon entering a negative number, the program should output the average of the numbers entered and terminate. Note: Consider the condition where the first entered number is negative and there are no positive integers entered prior to calculating the average. In such a scenario, instead of calculating the average, output a sentence $"$No positive integers entered to calculate the average".