#描述#
fasd

#格式#
##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1#
##样例输入1##

1 5
10 20
0 0

##样例输出1##

6
30

#限制#
5000ms
32768KB

#提示#

#来源#
HDU