文件名称:qian-dao-hou-xu
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从键盘接受一个小写字母,然后找出它们的前导字母和后续字母,再按顺序输出这三个字母-To accept a lower-case letters from the keyboard, and then find their leading letter and follow-up letters, and then the output of the three letters in the order
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qian dao hou xu.txt