(Check SSN) Write a program that prompts the user to enter a Social Security Number in the format DDD-DD-DDDD, where D is a digit. Your program should check whether the input is valid. Sample Run 1 Enter a SSN : 232-23-5435 232-23-5435 is a valid social security number Sample Run 2 Enter a SSN: 23-23-5435 23-23-5435 is an invalid social security number Class Name: Exercise04_21