#!/usr/bin/env ruby

min = 4
max = 20

puts "Username (Min Chars: 4, Max Chars: 20) => "
username = gets.chomp

def is_valid_length?(str, min, max)
    str.length >= max and str.length <= min
end

if is_valid_length?(username, min, max)
    puts "Invalid length, min: #{min} max: #{max}"
end

puts "Length: #{username.length}"