PROGRAMMING:Absolute value of integer
Input an integer from the keyboard and output its corresponding absolute value. It is required that mathematical functions cannot be used.
###Input format:
Enter an integer directly without any additional characters.
###Output format:
Directly output an integer without any additional characters.
###Input example:
```in
-3
```
###Output example:
```out
three
```
answer：If there is no answer, please comment
###Input format:
Enter an integer directly without any additional characters.
###Output format:
Directly output an integer without any additional characters.
###Input example:
```in
-3
```
###Output example:
```out
three
```
answer：If there is no answer, please comment