fizzbuzz = []
1.upto(30).each do |i|
    fizzbuzz[i] = (fizzbuzz[i] || '') + 'Fizz' if i % 3 == 0
    fizzbuzz[i] = (fizzbuzz[i] || '') + 'Buzz' if i % 5 == 0
end
puts fizzbuzz.length;
fizzbuzz.each { |v| puts v }