1001 A+B Format
题目：Calculate a+b and output the sum in standard formatthat is,the digits must be seperated into groups of three by commas (unless there are less than four digits).
Input
Each inout file contains one test case.Each case contains a pair of integers a and b where -1000000<=a,b<=1000000.The number are sperated by a space.
Output
For each test case ,you should output the sum of a and b in one line.The sum must be written in the standard format.
Sample Input
-1000000 9
Sample Output:
-999,991