Write a program that asks the user to enter the month (letting the user enter an integer in the range of 1 through 12) and the four-digit year. The program should then display the number of days in that month. Use the following criteria to identify leap years:

- Determine whether the year is divisible by 100. If it is, then it is a leap year if and only if it is divisible by 400. For example, 2000 is a leap year but 2100 is not.
- If the year is not divisible by 100, then it is a leap year if and only if the year is divisible by 4. For example, 2008 is a leap year but 2009 is not.

More examples:

The following years are not leap years: 1700, 1800, 1900, 2100, 2200, 2300, 2500, 2600

The following years are leap years: 1600, 2000, 2400

The output should look something like this:

Enter a month (1-12): 2

Enter a year: 2016

29 days