PROGRAMMING:Output days of the month

Enter a year and month from the keyboard, and output the number of days in the month (considering leap year).
Tip: if the year is divisible by 400, it is a leap year; If it can be divided by 4, but not by 100, it is also a leap year, otherwise it is not a leap year.
###Input format:
Enter any month (January to December) and year (1900 to 9999) that match the range, separated by spaces.
###Input example:
```in
2000 2
```
###Output example:
```out
year = 2000 month = 2 days=29
```
###Input example:
```in
2014 8
```
###Output example:
```out
year = 2014 month = 8 days=31
```






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