PROGRAMMING:A + B input output exercise (III)

Do I know what we need to do with this topic without saying it? Of course, the topic is a + B.
###Input format:
There are several groups of input data. We sum two integers respectively. When a and B are both 0, it is considered that the program ends, and the value of 0 + 0 is not output.
###Output format:
For each set of integers a and B, output the sum of the two.
Each output occupies one line.
###Input example:
Here is a set of inputs. For example:
```in
1 5
10 20
0 0
```
###Output example:
The corresponding output is given here. For example:
```out
six
thirty
```







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