a = gets
  b = []
  c = []
  b = a.split(/\n/)
  b.each { |x|
    y = x.lstrip.rstrip.split[0].to_f
    y = Math.sqrt(y)
    c << "%.4f" % y
  }
  puts c.reverse.join("\n")

seems to return the right values. am i messing up with the .split[0]? any help would be appreciated. thanks!