PROGRAMMING:The number of days in a year or month of sfy

Enter the year and month to judge how many days the month has?
###Input format:
Enter the year and month in the format of month and year
###Output format:
Outputs the number of days in the month.
###Input example:
Here is a set of inputs. For example:
```in
2005 2
2000 2
2010 12
```
###Output example:
The corresponding output is given here. For example:
```out
twenty-eight
twenty-nine
thirty-one
```







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