PROGRAMMING:Simple calculator (addition, subtraction, multiplication and division)

Input two number sum operators, operate the two numbers according to the operators, and output the results.
###Input format:
The input is in the format of operands 1 and 2.
###Output format:
Output the operation result (2 decimal places reserved).
###Input sample 1:
Here is a set of inputs. For example:
```in
3+2
```
###Output sample 1:
The corresponding output is given here. For example:
```out
five
```
###Input sample 2:
Here is a set of inputs. For example:
```in
-7/0
```
###Output sample 2:
The corresponding output is given here. For example:
```out
Divisor is 0!
```
###Input sample 3:
Here is a set of inputs. For example:
```in
3#2
```
###Output sample 3:
The corresponding output is given here. For example:
```out
ERROR!
```







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