题目

分析

因为题目的文件没有扩展名，刚开始还以为里面的编码是什么十六进制文件，查了一圈没找到对应的文件头。
重新审视字符串，发现字母最大到 f，尝试用十六进制解码，得到 flag：

Flag

flag{hello_world}

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