PROGRAMMING:4-2 judge leap year

4-2 input a positive integer year to judge whether year is a leap year.
###Input format:
For example, enter a positive integer on a line.
###Output format:
For example: output 2000 is leap year
###Input example:
Here is a set of inputs. For example:
```in
two thousand and nineteen
```
###Output example:
The corresponding output is given here. For example:
```out
2019 is not leap year.
```







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