## --- Day 4: Secure Container ---

You arrive at the Venus fuel depot only to discover it's protected by a password. The Elves had written the password on a sticky note, but someone threw it out.

However, they do remember a few key facts about the password:

- It is a six-digit number.
- The value is within the range given in your puzzle input.
- Two adjacent digits are the same (like
`22`

in`1`

).*22*345 - Going from left to right, the digits
*never decrease*; they only ever increase or stay the same (like`111123`

or`135679`

).

Other than the range rule, the following are true:

`111111`

meets these criteria (double`11`

, never decreases).`2234`

does not meet these criteria (decreasing pair of digits*50*`50`

).`123789`

does not meet these criteria (no double).

*How many different passwords* within the range given in your puzzle input meet these criteria?