arr = []
arr.push gets.chomp
arr.push gets.chomp
x = arr[0].split('.')
y = arr[1].split('.')
flag = false
x.each_with_index do |e, k|
  if e.to_i > y[k].to_i
    flag = true
  elsif e.to_i == y[k].to_i
    flag = true if k == 2
  else
    break;
  end
end
puts flag ? 'YES' : 'NO'