PROGRAMMING:Program to add two fractions.

Input two fractions, such as 3 / 4 + 1 / 2, output 3 / 4 + 1 / 2 = 5 / 4.
When running the program, as shown in the figure below:
###Input sample 1:
```in
3/4+1/2
```
###Input sample 2:
```in
1/6+1/2
```
###Output sample 1:
```out
3/4+1/2=5/4
```
###Output sample 2:
```out
1/6+1/2=2/3
```






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