s = gets.chomp
k = []

s.split("").each do |c|
  if c == "k"
    k = []
    k.push(c)
  elsif !k.empty?
    two = k[-2]
    if two.nil?
      if c == 'e'
        k.push(c)
      end
    else
      last = k[-2..-1]
      case last
      when "ke"
        push(c) if c == "y"
      when "ey"
        push(c) if c == "e"
      when "ye"
        push(c) if c == "n"
      when "en"
        push(c) if c == "c"
      when "nc"
        push(c) if c == "e"

        puts("YES")
        exit
      end
    end
  end
end

puts("NO")
