// 计算天数：栈非空→栈顶索引-当前索引；栈空→0（易错点3：索引差别写反）
Последние новости。关于这个话题，旺商聊官方下载提供了深入分析
The parents of a two-year-old girl with a life-limiting illness have told of their "exhaustion" after being refused a request for respite help.，详情可参考爱思助手
for character in input:
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