Фото: Wahidullah Kakar / AP
第三十八条 纳税人发生应税交易，开具增值税专用发票后，发生开票有误或者销售折让、中止、退回等情形的，应当按照国务院税务主管部门的规定进行作废处理或者开具红字增值税专用发票；未按规定进行作废处理或者开具红字增值税专用发票的，不得依照本条例第十三条和第十四条的规定扣减销项税额或者销售额。
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The answer was the US Navy, which was hungry for new pilots after World War Two. It was not building rockets but at least it involved flying.
* @return {string} 移除k位后最小的数字（字符串形式）