Easy reversable one:
```package hsctf;
public class ComputerScienceSolver {
	public static String revShift(String input) {        String ret = "";        for (int i = 0; i<input.length(); i++) {            ret += (char)(input.charAt(i) + i);        }        return ret;    }    public static String revShift2(String input) {        String ret = "";        for (int i = 0; i<input.length(); i++) {        	char c = input.charAt(i);        	if (c >= 103)        		ret += (char)(input.charAt(i) - 3);        	else        		ret +=(char)(input.charAt(i) - 2);        }        return ret;    } 	public static void main(String[] args) {		System.out.println(revShift(revShift2("inagzgkpm)Wl&Tg&io")));	}
}```