val = gets.chomp.split(" ").map(&:to_i)
val[0] += 1
if val[0] == val[1]
  puts "YES"
  puts 0
elsif val[0] < val[1]
  puts "YES"
  puts (val[0] - val[1]).abs  
else
  puts "NO"
  puts (val[0] - val[1]).abs
end