Calculate a+b and output the sum in standard format -- that is, the digits must be separated into groups of three by commas (unless there are less than four digits).

Input Specification:

Each input file contains one test case. Each case contains a pair of integers a and b where −10​6​​≤a,b≤10​6​​. The numbers are separated by a space.

Output Specification:

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

AC代码：

 #include <iostream>

 #include<cstdio>

 using namespace std;

 int main(int argc, char const *argv[])

 {

     int a, b;

     cin >> a >> b;

     int c = a + b;

     if (a + b < ) {

         cout << "-";

         c = -c;

     }

     if (c >= ) {

         printf("%d,%03d,%03d\n", c / , c %  / , c %  );

     } else if (c >= ) {

         printf("%d,%03d\n", c / , c % );

     } else {

         printf("%d\n", c );

     }

     return ;

 }