PROGRAMMING:What was the day before yesterday

This topic requires to read in the year, month, day, and then judge the day before yesterday.
###Input format:
Enter the year, month, and day on one line（ Date is valid)
###Output format:
Output the date of the day before yesterday in the format of 2020-10-16
###Input example:
```in
2020 10 16
```
###Output example:
```out
2020-10-14
```
###Input example:
```in
2020 1 2
```
###Output example:
```out
2019-12-31
```
###Input example:
```in
2020 3 2
```
###Output example:
```out
2020-2-29
```
###Input example:
```in
2019 3 2
```
###Output example:
```out
2019-2-28
```







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