Chef and String

Chef has a string $S$ consisting of lowercase English characters. Chef defined functions left shift $L(X)$ and right shift $R(X)$ as follows. - $L(X)$ is defined as shifting all characters of string $X$ one step towards left and moving the first character to the end. - $R(X)$ is defined as shifting all characters of string $X$ one step towards the right and moving the last character to the beginn