def input_validation(input):
    """
        This function is used to test the stock ticker inputs and validate that they
        pass the two key characteristics tests: being less than 5 characters in length
        and having no digits.

        @param: input is a string argument that represents the given input the consumer gave as a ticker.

    """
    result_bool = True 

    if any(char.isdigit() for char in input) == True:
        result_bool = False

    if len(input) > 5:
        result_bool = False
    
    return result_bool