Problem 3

Password Strength Tagger

EASYBUILD

Strings+2

Implement tag_password_strength(password) that returns a strength label. Return "invalid" if the password contains any whitespace. Otherwise count how many character categories appear: lowercase, uppercase, digit, symbol. Return "weak" if len < 8 or fewer than 2 categories; "medium" if 8 <= len <= 11 with at least 2 categories; "strong" if len >= 12 with at least 3 categories.

Examples

Example 1

Input

password = "Abcdef12"

Output

"medium"

Note

Length 8, contains uppercase, lowercase, and digits — 3 categories.

Example 2

Input

password = "Abc 12345"

Output

"invalid"

Note

Contains a space.

Constraints

0 <= len(password) <= 200
password may contain any ASCII characters

Hints

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