def input_digit(input_msg, max_retries=4, fail_msg='Invalid input, this channel will be skipped'):
    """Show the user an input dialogue to enter a digit, return 0 if it failed after max_retries"""
    num, count = 0, 0
    while True:
        count += 1
        try:
            num = int(input(input_msg + ' '))
            break
        except ValueError:
            if count < max_retries:
                print("Your input wasn't a number, please try again:")
            else:
                print(fail_msg)
                break
    return num