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#String to decode
rot_str = "Fraq hf gur pbqr lbh hfrq gb qrpbqr guvf zrffntr"

##Rotates string alphabet characters by 13
def rot13(rotstring) 
  rotstring.tr 'A-Za-z', 'N-ZA-Mn-za-m'
end

puts rot13(rot_str)