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"So we want to just take advantage of this to set up both vendors for future success on a lunar landing," he said. "This is the proper way to do it, if it works out from a timing perspective, to be able to rendezvous and dock with both. ... This, again, is the right way to proceed in order to have a high confidence opportunity in '28 to land."
描述：给定字符串 num（非负整数）和整数 k，移除 k 位数字，使剩余数字最小。以字符串形式返回（不含前导零）。