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 %w(k e)
        k.push(c) if c == "y"
      when %w(e y)
        k.push(c) if c == "e"
      when %w(y e)
        k.push(c) if c == "n"
      when %w(e n)
        k.push(c) if c == "c"
      when %w(n c)
        k.push(c) if c == "e"

        puts("YES")
        exit
      end
    end
  end
end

puts("NO")