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+                                           Advent of Code
+
+   br0xen 40*
+
+     • [About]
+     • [Stats]
+     • [Leaderboard]
+     • [Settings]
+     • [Log out]
+
+--- Day 19: Medicine for Rudolph ---
+
+   Rudolph the Red-Nosed Reindeer is sick! His nose isn't shining very brightly, and he needs
+   medicine.
+
+   Red-Nosed Reindeer biology isn't similar to regular reindeer biology; Rudolph is going to need
+   custom-made medicine. Unfortunately, Red-Nosed Reindeer chemistry isn't similar to regular
+   reindeer chemistry, either.
+
+   The North Pole is equipped with a Red-Nosed Reindeer nuclear fusion/fission plant, capable of
+   constructing any Red-Nosed Reindeer molecule you need. It works by starting with some input
+   molecule and then doing a series of replacements, one per step, until it has the right
+   molecule.
+
+   However, the machine has to be calibrated before it can be used. Calibration involves
+   determining the number of molecules that can be generated in one step from a given starting
+   point.
+
+   For example, imagine a simpler machine that supports only the following replacements:
+
+ H => HO
+ H => OH
+ O => HH
+
+   Given the replacements above and starting with HOH, the following molecules could be generated:
+
+     • HOOH (via H => HO on the first H).
+     • HOHO (via H => HO on the second H).
+     • OHOH (via H => OH on the first H).
+     • HOOH (via H => OH on the second H).
+     • HHHH (via O => HH).
+
+   So, in the example above, there are 4 distinct molecules (not five, because HOOH appears twice)
+   after one replacement from HOH. Santa's favorite molecule, HOHOHO, can become 7 distinct
+   molecules (over nine replacements: six from H, and three from O).
+
+   The machine replaces without regard for the surrounding characters. For example, given the
+   string H2O, the transition H => OO would result in OO2O.
+
+   Your puzzle input describes all of the possible replacements and, at the bottom, the medicine
+   molecule for which you need to calibrate the machine. How many distinct molecules can be
+   created after all the different ways you can do one replacement on the medicine molecule?
+
+   Your puzzle answer was 518.
+
+--- Part Two ---
+
+   Now that the machine is calibrated, you're ready to begin molecule fabrication.
+
+   Molecule fabrication always begins with just a single electron, e, and applying replacements
+   one at a time, just like the ones during calibration.
+
+   For example, suppose you have the following replacements:
+
+ e => H
+ e => O
+ H => HO
+ H => OH
+ O => HH
+
+   If you'd like to make HOH, you start with e, and then make the following replacements:
+
+     • e => O to get O
+     • O => HH to get HH
+     • H => OH (on the second H) to get HOH
+
+   So, you could make HOH after 3 steps. Santa's favorite molecule, HOHOHO, can be made in 6
+   steps.
+
+   How long will it take to make the medicine? Given the available replacements and the medicine
+   molecule in your puzzle input, what is the fewest number of steps to go from e to the medicine
+   molecule?
+
+   Your puzzle answer was 200.
+
+   Both parts of this puzzle are complete! They provide two gold stars: **
+
+   At this point, you should return to your advent calendar and try another puzzle.
+
+   If you still want to see it, you can get your puzzle input.
+
+   You can also [Shareon Twitter Google+ Reddit] this puzzle.
+
+References
+
+   Visible links
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+   . http://adventofcode.com/
+   . http://adventofcode.com/day/19/input
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