(Check SSN) Write a program that prompts the user to enter a Social Security number in the format ddd-dd-, 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