KASEKI=gets.split('.')
TARGET=gets.split('.')

if TARGET[0]==KASEKI[0] && TARGET[1]==KASEKI[1] && TARGET[2]<=KASEKI[2]
  puts "YES"
elsif TARGET[0]==KASEKI[0] && TARGET[1]==KASEKI[1] && KASEKI[2]<TARGET[2]
  puts "NO"
elsif TARGET[0]==KASEKI[0] && TARGET[1]<=KASEKI[1]
  puts "YES"
elsif TARGET[0]==KASEKI[0] && KASEKI[1]<TARGET[1]
  puts "NO"
elsif TARGET[0]<=KASEKI[0]
  puts "YES"
else
  puts "NO"
end