Python 3 Programming Question

Credit cards consist of a standard numerical system consisting of 16 digits. The 1st digit will identify the card company:

Visa - 4

MasterCard - 5

Discover - 6

Write a program that prompts for a 16 digit card number and reports as follows:

Invalid card number (incorrect number of digits);

Identify as Visa, MasterCard, or Discover;

Other card (does not start with 4, 5, or 6).