--- 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 122345).

 - 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).

 - 223450 does not meet these criteria (decreasing pair of digits 50).

 - 123789 does not meet these criteria (no double).


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