Write a program to score the paper-rock-scissors game. Each of two players enters either P, R, or S. The program that announces the winner as well as the basis for determining the winner: "Paper covers rock", "Rock breaks scissors", "Scissors cut paper", or "Draw, nobody wins". The players must be able to enter either upper- or lower-case letters. If an invalid choice is entered, the player should be permitted to re-enter his choice up to 5 times (and then you announce an error and exit the program). When one game finishes, ask if the players want to continue (Y for yes, exit for anything else). A Y response means you play the game over again.