#!/usr/bin/env ruby

lower = ('0'..'Z').to_a
upper = ('0'..'z').to_a
extra = '!@#$%^&*()_+-=[]{}|\''.scan(/./)

possiblities = lower + upper + extra

output_string = ''
output_length = (ARGV[0] || 8).to_i

output_length.times do |n|
  output_string << possiblities.shuffle.first()
end

puts output_string