Day.java

public class Day {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		
		if(args.length != 2) {
			System.out.println("Usage: LetterGrade <numeric-score>");
			return;
		}
		
        int month = Integer.parseInt(args[0]);
        int year = Integer.parseInt(args[1]);
        switch(month){
                case 1 :
                case 3 :
                case 5 :
                case 7 :
                case 8 :
                case 10:
                case 12: System.out.println("31 Days");break;
                case 4 :
                case 6 :
                case 9 : 
                case 11 : System.out.println("30 Days");break;
                case 2 : if(year % 4 == 0 && year % 100 != 0 || year % 400 == 0)
                                System.out.println("29 Days");
                        else System.out.println("28 Days");break;
        	default : System.out.println("Invalid input");break;
                }
        }
}