**Problem Description**

**Input**

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.

**Output**

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.

**Sample Input**

1 5 10 20 0 0

**Sample Output**

6 30