PROGRAMMING:Judge leap year

Read in an integer year to determine whether it is a leap year.
A leap year is a year that can be divided by four but not 100, or by 400.
###Input format:
Enter a positive integer for the year
###Output format:
If it is a leap year, output yes, otherwise output No
###Input sample 1:
```in
two thousand
```
###Output sample 1:
```out
yes
```
###Input sample 2:
```in
two thousand and one
```
###Output sample 2:
```out
no
```







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