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# [Vyxal](https://github.com/Vyxal/Vyxal/tree/version-2), 27 bytes 

```
QabcdefghijKlmnopqrstUvwxyz
```

[Try it Online!](https://vyxal.pythonanywhere.com/?v=2&c=1#WyIiLCIiLCJRYWJjZGVmZ2hpaktsbW5vcHFyc3RVdnd4eXoiLCIiLCIzIl0=)


Works by exiting straight away. The joys of a language where every letter is a built-in function.

## Explained

```
QabcdefghijKlmnopqrstUvwxyz
Q                            # Terminate the program
 a                           # Are any of the items in the (non-existent) input truthy?
  b                          # Convert that to binary
   c                         # Is that in the input?
    d                        # Double the result of that
     e                       # input ** that
      f                      # Flatten into a list of digits
       g                     # Get the smallest digit
        h                    # Push digit[0]
         i                   # and get the inputh digit of that
          j                  # Join the input on the result. This will give a string.
           K                 # All non-empty substrings of the stringthat occur more than once in the string
            l                # Get the pairwise overlaps of that list
             m               # And mirror it
              n              # Push the string "abcdefghijklmnopqrstuvwxyz"
               o             # And remove that from the mirrored list
                p            # Prepend that to the input
                 q           # Surround in backticks, escaping backslashes and existing backticks
                  r          # Does the input contain a regex match of that?
                   s         # Sort that
                    t        # Push that[-1]
                     U       # Uniquify the result
                      vw     # Wrap each item
                        x    # Call this program all over again
                         yz  # Incidentally, this is never executed, but then again, neither is the entire program after the first Q. :p        
```