Return order and position of the first 'x' charter-length string in 500 character-length string

charicters500.rb

puts "* * *"
puts "Enter 500 characters"
c500 = gets.chomp
puts "Would you like 4 character window or 8 character window? Type 4 or 8."
window_length = gets.chomp

result = []

window_lengthed_str = c500[0..(window_length.to_i-1)]

c500.scan(window_lengthed_str) do |c|
  result << [c, $~.offset(0)[0]]
end

puts "* * *"

result.each_with_index do |r, index|
  puts "Order: #{index+1}, position: #{r[1]+1}\n"
end