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  • \$\begingroup\$ Can you provide a test suite link also, please? \$\endgroup\$ Commented Oct 17, 2016 at 9:23
  • \$\begingroup\$ @ʰᵈˑ added an R-fiddle test suite. Note that the test suite uses a function instead of reading input from stdin as explained in the edited answer. \$\endgroup\$ Commented Oct 17, 2016 at 9:59
  • \$\begingroup\$ Is this answer valid, since you have to use " around the input string? \$\endgroup\$ Commented Oct 17, 2016 at 21:06
  • \$\begingroup\$ @rturnbull I don't see why not. Wrapping every entry with quotes and pressing enter would yield the equivalent result (e.g.: "Hello world" => enter => "-wo" => enter => "-ld" => enter => "+Ea" => enter =>"+th") which is usually how strings are read anyways. \$\endgroup\$ Commented Oct 17, 2016 at 21:16
  • 1
    \$\begingroup\$ Yeah it's really up to the OP! I personally like your answer as-is, but I was worried that it might be invalid. Looking at answers for other languages it seems like quotes are pretty accepted. While I have your attention, I think you can golf off 4 bytes by changing l=length(i) to l=length(i)/2 and updating the later references to l. \$\endgroup\$ Commented Oct 17, 2016 at 21:57