тестовое задание 1 (FS)

puts 'Enter sequence'
mass = String(gets.chomp)
mass = mass.split(//);
count = 1
exit_mass = []
b = ''
mass.each_with_index do |a, index|
  if index > 0
    if  b == a
      count +=1
    else
      exit_mass << count
      exit_mass << b
      count = 1
      b = a
    end
  else
    b = a
  end
end
exit_mass << count
exit_mass << b
exit_mass = exit_mass.join('')
puts exit_mass