4. The mirror image of string vov is string yov, and the mirror image of string wood is string boow, The mirror image of string bed cannot be represented as a string, because the mirrror image of e is not a valid character.- Implement a function mirror() that takes a string and returns its mirror image but only if the mirror image can be represented using letters in the alphabet.*- mirror(vov) >>>mirror('bed') INVALID >>> mirror(wood')*