PROGRAMMING:Square root of integer
Input an integer x from the keyboard. If x is a positive number, then output its square root. Negative numbers are not considered.
###Input format:
Enter an integer directly without any additional characters.
###Output format:
Direct output of a square root, requires the retention of 6 decimal places, no other additional characters.
###Input example:
```in
four
```
###Output example:
```out
two
```
answer：If there is no answer, please comment
###Input format:
Enter an integer directly without any additional characters.
###Output format:
Direct output of a square root, requires the retention of 6 decimal places, no other additional characters.
###Input example:
```in
four
```
###Output example:
```out
two
```
answer：If there is no answer, please comment