PROGRAMMING:3-3. Input integer and output its absolute value

Write a program, such as the following input an integer value, show its absolute value.
```
Please enter an integer: - 8 (enter)
The absolute value is 8.
```
###Input example:
Enter an integer and enter. For example:
```in
8 (enter)
```
###Output example:
```out
Please enter an integer: the absolute value is 8.
```







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