def split_by_range(numbers):
    result = []
    tmp = []

    last_number = numbers.pop(0)
    tmp.append(last_number)

    split_flag = False
    for number in numbers:

        # print result
        if number - last_number == 1:
            # just next step
            if not split_flag:
                # result.append('-')
                split_flag = True
        else:
            # new number in range
            if split_flag:
                print '! %s' % tmp
                tmp.append(last_number)
                split_flag = False
                result.append('-'.join([str(x) for x in tmp]))

            else:
                print 'clear %s' % tmp
                result.extend(tmp)

            tmp = []
            tmp.append(number)

        last_number = number

    if split_flag:
        tmp.append(last_number)
        result.append('-'.join([str(x) for x in tmp]))
    else:
        result.append(last_number)

    # result = ''.join((str(x) for x in result))

    return result