1001 A+B Format

#include <iostream>
#include <vector>
using namespace std;

int main() {
	
	int a, b;
	
	cin >> a >> b;
	
	int res = a + b;
	
	if (res < 0) {
		cout << "-";
		res = -res;
	}
	
	if (res == 0) {
		cout << 0 << endl;
		return 0;
	}
	int flag = true;
	vector<int> res_vec;
	while (res > 0) {
		res_vec.push_back(res % 1000);
		res = res / 1000;
	}
	int first = true;
	for (auto it = res_vec.rbegin(); it!= res_vec.rend(); it++) {
		if (first == true) {
			printf("%d", *it);
			first = false;
		} else {
			printf(",%.03d", *it);
		}
    }
    
    cout << endl;

	
	return 0;
}