PROGRAMMING:Square root formatting
requirement:
Obtain an integer a input by the user, calculate the square root of a, reserve 3 decimal places, and print out.
The output result is 30 characters wide, right aligned, and extra characters are filled with plus sign (+). If the result exceeds 30 characters, the width of the result shall prevail.
###Input output example:
###Input sample
```in
ten
```
###Output sample
```out
+++++++++++++++++++++++++3.162
```
answer：If there is no answer, please comment
Obtain an integer a input by the user, calculate the square root of a, reserve 3 decimal places, and print out.
The output result is 30 characters wide, right aligned, and extra characters are filled with plus sign (+). If the result exceeds 30 characters, the width of the result shall prevail.
###Input output example:
###Input sample
```in
ten
```
###Output sample
```out
+++++++++++++++++++++++++3.162
```
answer：If there is no answer, please comment