The red-green-blue color "#AABBCC " can be written as "#ABC " in shorthand. For example, "#15c " is shorthand for the color "#1155cc ". The similarity between the two colors "#ABCDEF " and "#UVWXYZ " is -(AB - UV)2 - (CD - WX)2 - (EF - YZ)2. Given a string color that follows the format "#ABCDEF ", return a string represents the color that is most similar to the given color and has a shorthand (i.e., it can be represented as some "#XYZ "). Any answer which has the same highest similarity as the best answer will be accepted.