like validation rules for input. In other ways, they were very primitive,
输入：num = "1432219", k = 3
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记者今天（28日）了解到， 市场监管总局（国家标准委）批准发布《人体生物监测质量保证规范》国家标准。该标准由国家疾病预防控制局组织起草，自3月1日起正式实施。
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Eighteen months later, Crawford was paid £5.9m for a single month - almost the same as the entire contract's initial estimated value, the BBC has discovered.