public static String a(String str) {
        int length = str.length();
        char[] cArr = new char[length];
        length--;
        int i = length;
        while (length >= 0) {
            int i2 = i - 1;
            cArr[i] = (char) (str.charAt(i) ^ 43);
            if (i2 < 0) {
                break;
            }
            length = i2 - 1;
            cArr[i2] = (char) (str.charAt(i2) ^ 5);
            i = length;
        }
        return new String(cArr);
    }