def lscan; gets.split.map(&:to_f); end
def bye(msg); puts msg.to_s; exit; end
a,b,c,d = lscan

i = 2.0
j = a-c
k = b-d

q = j*j-4.0*i*k
bye 'No' if q < 0
bye 'Yes' if q.abs < 1e-9
# https://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q1147987886
puts [(a+c)/2,(b+d)/2]*' '