In a certain code language, 'x' represents '+', '÷' represents 'x', '' represents '÷' and '+' represents ''. Find out the answer to the following question.
Five planes, A, B, P, Q and R were saluting on Independence Day in such a way that R was second to the left of Q but to the immediate right of A. There was one plane between B and P. B was not at any of the ends. P and Q were neighbours. Who was at the left end?