PROGRAMMING:You answer the question by computer

Enter a four arithmetic expression (add, subtract, multiply, divide) in the form of a + B to represent the question you give to the computer. Let the computer output the results, please output in the sample format. If the divisor is 0, the illegal operation information is output: illegal operation
###Input example:
```in
56+23
```
###Output example:
```out
56+23=79
```
###Input example:
```in
12*3
```
###Output example:
```out
12*3=36
```
###Input example:
```in
12/0
```
###Output example:
```out
Illegal operation
```
###Input example:
```in
-5*-5
```
###Output sample (simple output, negative number does not need special processing)
```out
-5*-5=25
```






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