View Code of Problem 101

#include<string>
#include<iostream>
#include<algorithm>
using namespace std;
int main() {
	string a,b;
	while (cin >> a) {
		while (a.find(',') != -1) {
			a.erase(a.find(','), 1);
		}
		int k = a.size() % 3;
		int i;
		if (k == 0) {
			for (i = 0; i < a.size(); i++) {
				cout << a[i];
			}
		}
		else {
			for (i = 0; i < k; i++) {
				cout << a[i];
			}
			while (i < a.size()) {
				printf(",");
				int num = 3;
				while (num--) {
					cout << a[i];
					i++;
				}
			}
		}
		cout << endl;
	}

	return 0;
}