zgfif

require 'active_model'

class Person
  include ActiveModel::Validations

  attr_accessor :name, :age

  def initialize(name: nil, age: nil)
    @name = name
    @age = age

zgfif

class Animal
  attr_reader :distance

  def initialize
    @distance = 0
  end

  def step!
    @distance += 1
  end

zgfif

def count_letters(text)
  array = []
  text = text.downcase
  text.each_char do |char|
    if char =~ /[A-Za-z]+/
      count = text.count(char)
      array << [char, count]
    end
  end
  array = array.uniq