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+Advent of Code
+
+--- Day 9: Stream Processing ---
+
+   A large stream blocks your path. According to the locals, it's not safe to cross the stream at the moment because it's full of garbage. You look down at the
+   stream; rather than water, you discover that it's a stream of characters.
+
+   You sit for a while and record part of the stream (your puzzle input). The characters represent groups - sequences that begin with { and end with }. Within a
+   group, there are zero or more other things, separated by commas: either another group or garbage. Since groups can contain other groups, a } only closes the
+   most-recently-opened unclosed group - that is, they are nestable. Your puzzle input represents a single, large group which itself contains many smaller ones.
+
+   Sometimes, instead of a group, you will find garbage. Garbage begins with < and ends with >. Between those angle brackets, almost any character can appear,
+   including { and }. Within garbage, < has no special meaning.
+
+   In a futile attempt to clean up the garbage, some program has canceled some of the characters within it using !: inside garbage, any character that comes after
+   ! should be ignored, including <, >, and even another !.
+
+   You don't see any characters that deviate from these rules. Outside garbage, you only find well-formed groups, and garbage always terminates according to the
+   rules above.
+
+   Here are some self-contained pieces of garbage:
+
+     * <>, empty garbage.
+     * <random characters>, garbage containing random characters.
+     * <<<<>, because the extra < are ignored.
+     * <{!>}>, because the first > is canceled.
+     * <!!>, because the second ! is canceled, allowing the > to terminate the garbage.
+     * <!!!>>, because the second ! and the first > are canceled.
+     * <{o"i!a,<{i<a>, which ends at the first >.
+
+   Here are some examples of whole streams and the number of groups they contain:
+
+     * {}, 1 group.
+     * {{{}}}, 3 groups.
+     * {{},{}}, also 3 groups.
+     * {{{},{},{{}}}}, 6 groups.
+     * {<{},{},{{}}>}, 1 group (which itself contains garbage).
+     * {<a>,<a>,<a>,<a>}, 1 group.
+     * {{<a>},{<a>},{<a>},{<a>}}, 5 groups.
+     * {{<!>},{<!>},{<!>},{<a>}}, 2 groups (since all but the last > are canceled).
+
+   Your goal is to find the total score for all groups in your input. Each group is assigned a score which is one more than the score of the group that immediately
+   contains it. (The outermost group gets a score of 1.)
+
+     * {}, score of 1.
+     * {{{}}}, score of 1 + 2 + 3 = 6.
+     * {{},{}}, score of 1 + 2 + 2 = 5.
+     * {{{},{},{{}}}}, score of 1 + 2 + 3 + 3 + 3 + 4 = 16.
+     * {<a>,<a>,<a>,<a>}, score of 1.
+     * {{<ab>},{<ab>},{<ab>},{<ab>}}, score of 1 + 2 + 2 + 2 + 2 = 9.
+     * {{<!!>},{<!!>},{<!!>},{<!!>}}, score of 1 + 2 + 2 + 2 + 2 = 9.
+     * {{<a!>},{<a!>},{<a!>},{<ab>}}, score of 1 + 2 = 3.
+
+   What is the total score for all groups in your input?
+
+   Your puzzle answer was ______.
+
+--- Part Two ---
+
+   Now, you're ready to remove the garbage.
+
+   To prove you've removed it, you need to count all of the characters within the garbage. The leading and trailing < and > don't count, nor do any canceled
+   characters or the ! doing the canceling.
+
+     * <>, 0 characters.
+     * <random characters>, 17 characters.
+     * <<<<>, 3 characters.
+     * <{!>}>, 2 characters.
+     * <!!>, 0 characters.
+     * <!!!>>, 0 characters.
+     * <{o"i!a,<{i<a>, 10 characters.
+
+   How many non-canceled characters are within the garbage in your puzzle input?
+
+   Your puzzle answer was ______.
+
+   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.
+
+References
+
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+   . http://adventofcode.com/2017/day/9/input