The strong password

Problem

Your bank wants a new password from you, and it won't take just any. Before you send it in, you'd like to check it yourself.

Write a function that takes the password, a string, and returns true if it is strong and false if it is not. It is strong when it meets all four rules at once: it is 8 characters long or more, and it has at least one uppercase letter, at least one lowercase letter and at least one digit from 0 to 9.

Every character counts toward the length, spaces and symbols included. But a symbol like !, # or - is not a letter: it counts neither as uppercase nor as lowercase. Letters go from a to z, and passwords have no accented letters.

"Harbor2024" is strong: 10 characters, an uppercase H, arbor in lowercase and digits. "harbor2024" is not, because it has no capital.

Examples

• The one from the example

  "Harbor2024" → true

• Too short

  "Sun7sea" → false

• No digit

  "Wonderful" → false

• Nothing but digits

  "12345678" → false

• With spaces and symbols

  "My dog: 3" → true

Besides these, the challenge has hidden tests that are revealed when you submit your solution.

You start with this

def is_strong(password):
    pass

function isStrong(password) {
}