** --- 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?

Your puzzle answer was =2090=.

** --- Part Two ---
An Elf just remembered one more important detail: the two adjacent
matching digits /are not part of a larger group of matching digits/.

Given this additional criterion, but still ignoring the range rule, the
following are now true:

- =112233= meets these criteria because the digits never decrease and
  all repeated digits are exactly two digits long.
- =123444= no longer meets the criteria (the repeated =44= is part of a
  larger group of =444=).
- =111122= meets the criteria (even though =1= is repeated more than
  twice, it still contains a double =22=).

/How many different passwords/ within the range given in your puzzle
input meet all of the criteria?

Your puzzle answer was =1419=.