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）。
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Трамп высказался о непростом решении по Ирану09:14
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That brings me to Klefki, which is literally a living ring of keys. Series lore suggests Klefki uses the keys as a defense mechanism by rattling them, but the keys also hold deep meaning for the creature, as it will hold onto its favorite ones for long periods. I love this little guy.