#!/usr/bin/ruby

# f2c: 5*(F - 32)/9
# c2f: 9*C/5 + 32

degrees = ARGV[0]
current = degrees[0, degrees.length - 1].to_f
fc = degrees[-1,1]

if (fc == "f")
  converted = 5*(current-32)/9
  puts "#{current}°F = #{converted}°C"
else 
  if (fc == "c") 
    puts "dd"
  else
    puts "ERROR: #{fc} is not a valid unit of measure."
  end
end