people = gets.split.map(&:to_i)

if people[0]+1 == people[1]
    puts "YES"
    puts 0
elsif people[0]+1 > people[1]
    puts "YES"
    puts people[0]+1 - people[1]
elsif people[0]+1 < people[1]
    puts "NO"
    puts people[1] - (people[0]+1)
end