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;
		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;
}