Inverse problem by n8theGr8

public class I{public static void main(String [] args){try{String s = new java.io.DataInputStream(System.in).readLine();for (int i = 0 ; i < s.length() ; i ++)System.out.print((char) (((s.charAt(i) * 7) % 256) + 7));}catch(Exception e){}}}\x0d
\x0d

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

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