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# A+B for Input-Output Practice (III)

## 输入格式

Input contains multiple test cases. Each test case contains a pair of integers a and b, one pair of integers per line. A test case containing 0 0 terminates the input and this test case is not to be processed.

## 输出格式

For each pair of input integers a and b you should output the sum of a and b in one line, and with one line of output for each line in input.

## 样例输入

1 5
10 20
0 0


## 样例输出

6
30