def solution(a, b)
    c = 0
    if a > 0 && b > 0
      aArray = a.to_s.split('').map(&:to_i)
      bArray = b.to_s.split('').map(&:to_i)
      for i in aArray
        cArray = cArray + aArray[i]
        cArray = cArray + bArray[i]
      end
 #     puts aArray.class
    else
      puts "non ok"
    end
  end