1001. A+B Format (20)

#include <iostream>
#include <stdio.h>
#include <string.h>
#include <vector>
#include <map>
#include <stack>
#include <queue>
#include <algorithm>
#include <set>
using namespace std;

int main()
{
  int a,b;
  int sum;
  while(scanf("%d%d",&a,&b) != EOF){
        sum = a+b;
    if(sum < 0){
    printf("-");
    sum = -sum;
    }
    if(sum>=1000000){
        printf("%d,%03d,%03d\n",sum/1000000, (sum/1000)%1000, sum%1000);
    }
    else if(sum >= 1000){
        printf("%d,%03d\n",sum/1000,sum%1000);
    } else{
        printf("%d\n", sum);
    }
  }
  return 0;
}