#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<map>
#define all(x) x.begin(),x.end()
#define pb push_back
#define ll long long 
#define P pair<int,int>
#define LP pair<ll,ll>
using namespace std;
int main() {
	int a;
	string n;
	cin >> n;
	a = n.length();
	for(int i =0; i <a; i++) {
		if (a % 3 == 0) {
			cout << n[i];
			if (i % 3 == 2 and i != a - 1) cout << ',';
		}
		else if(a%3==1) {
			cout << n[i];
			if (i % 3 == 0 and i != a - 1) cout << ',';
		}
		else {
			cout << n[i];
			if (i % 3 == 1 and i != a - 1) cout << ',';
		}
	}
		
		cout << endl;
	

	
	return 0;
}