Design a game application that plays the children's game of rock, paper, scissors. The user enters a letter indicating a choice. The Math.random method is then used to pick a value in the range of one through three, with one corresponding to rock, 2 corresponding to paper, and 3 corresponding to scissors. The computer's choice is compared to the users choice according to the rules: rock breaks scissors, scissors cuts paper, paper covers rock. Choices that match are ties. The application ends when the user enters an invalid.