PROGRAMMING:Enter the year and month

Input a year and month, output the number of days in this month.
###Input format:
Enter the year and month separated by a space.
###Output format:
Enter the number of days for the month of the year.
###Input example:
```in
2000 2
```
###Output example:
```out
twenty-nine
```
###Input example:
```
1900 2
```
###Output example:
```
twenty-eight
```
###Input example:
```
1900 6
```
###Output example:
```
thirty
```






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