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+--- Day 12: Rain Risk ---
+
+Your ferry made decent progress toward the island, but the storm came in faster than anyone
+expected. The ferry needs to take evasive actions!
+
+Unfortunately, the ship's navigation computer seems to be malfunctioning; rather than giving a route
+directly to safety, it produced extremely circuitous instructions. When the captain uses the PA
+system to ask if anyone can help, you quickly volunteer.
+
+The navigation instructions (your puzzle input) consists of a sequence of single-character
+actions paired with integer input values. After staring at them for a few
+minutes, you work out what they probably mean:
+
+
+ - Action N means to move north by the given value.
+ - Action S means to move south by the given value.
+ - Action E means to move east by the given value.
+ - Action W means to move west by the given value.
+ - Action L means to turn left the given number of degrees.
+ - Action R means to turn right the given number of degrees.
+ - Action F means to move forward by the given value in the direction the
+ship is currently facing.
+
+
+The ship starts by facing east. Only the L and R actions change the direction the ship
+is facing. (That is, if the ship is facing east and the next instruction is N10, the ship would move
+north 10 units, but would still move east if the following action were F.)
+
+For example:
+
+F10
+N3
+F7
+R90
+F11
+
+These instructions would be handled as follows:
+
+
+ - F10 would move the ship 10 units east (because the ship starts by facing east) to east
+10, north 0.
+ - N3 would move the ship 3 units north to east 10, north 3.
+ - F7 would move the ship another 7 units east (because the ship is still facing east) to
+east 17, north 3.
+ - R90 would cause the ship to turn right by 90 degrees and face south; it remains at
+east 17, north 3.
+ - F11 would move the ship 11 units south to east 17, south 8.
+
+
+At the end of these instructions, the ship's Manhattan distance (sum of the absolute values of its
+east/west position and its north/south position) from its starting position is 17 + 8 =
+25.
+
+Figure out where the navigation instructions lead. What is the Manhattan distance between
+that location and the ship's starting position?
+
+