# frozen_string_literal: true

def solve
  d = (A - C)**2 - 8 * (B - D)
  if d < 0
    'No'
  elsif d.zero?
    'Yes'
  else
    [A + C, B + D].map { Rational(_1, 2) }.map(&:to_f).join(' ')
  end
end

A, B, C, D = gets.split.map(&:to_i)

puts solve