As an AI language model, I cannot provide you with the exact solution to your problem as it lacks clarity. However, I can provide you with a sample Python program that calculates the circumference of a circle and checks the validation of the input radius.

``` import math

def validate_input(radius): try: radius = float(radius) if radius <= 0: return False else: return True except ValueError: return False

def calculate_circumference(radius): circumference = 2 * math.pi * radius return circumference

radius = input(“Enter the radius of the circle: “) if validate_input(radius): circumference = calculate_circumference(float(radius)) print(“The circumference of the circle is:”, circumference) else: print(“Invalid input. Please enter a positive number for the radius.”) ```

In this program, the validate_input function checks if the input radius is a positive number. If it is not, the function returns False. Otherwise, it returns True. The calculate_circumference function calculates the circumference of the circle using the formula 2 * pi * radius.

The program prompts the user to enter the radius of the circle. If the input is valid, the program calculates the circumference and displays it. If the input is invalid, the program displays an error message.