Set symmetric difference by 51b

import std.cstream,std.string;void main(){auto t=split=din.toString~" ~";foreach(i,s;t.sort)(!i||t[i-1]<s)&&s<t[i+1]&&dout.writef(s," ");}

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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