# coding: utf-8

def fizzbuzz(n)
  count = 0
  # fizzbuzz
  (1..n).each do |i|
    if i % 3 == 0 && i % 5 == 0
      count += 2
    else
      count += 2
    end
  end
  count.to_i
end

puts 'input digits'
input = $stdin.gets.to_i

char = 'z'
puts char * fizzbuzz(input)