Sequence of Robot moves in Circular or not

Problem Name : Check whether given sequence of robot moves is circular or not. Problem description : Write the 'isCircular' function that takes a a sequence of moves for a robot as a string, check if the sequence is circular or not. A sequence of moves is circular if first and last positions of robot are same. A move can be on of the following. G - Go one unit L - Turn left R - Turn right