class Test1
  def solution(a, b)
    max = 100000000
    if a >= 0 && b >= 0
      aArray = a.to_s.split('').map(&:to_i)
      bArray = b.to_s.split('').map(&:to_i)
      cArray = Array.new
      aArray.each do |el|
        cArray = cArray.push(aArray[el-1])
        cArray = cArray.push(bArray[el-1])
      end
      c = cArray.join.to_i
      if c > max
        puts "no ok"
        return -1
      else
        puts c
        return c
      end
    else
      return -1
    end
  end
end