Inverse problem by pooq

class A{public static void main(String[]_)throws Exception{String s=new java.io.DataInputStream(System.in).readLine();for(int i=0;i<s.length();)System.out.print((char)((s.charAt(i++)*7+7)&255));}}

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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