#include<iostream>
#include<algorithm>
#include<vector>
#include<string>
#include<utility>
#include<map>
#include<set>
#include<queue>
#include<stack>
#include<functional>
#include<math.h>
#include<random>
#include <bitset>
using namespace std;
#define N (1000000000+7)
//#define N 998244353
#define INF 1e16
typedef long long ll;
typedef pair<int,int> P;
typedef pair<int,P> Q;

const int inf = (int)1e9; 

ll gcd(ll a, ll b) {
	if (b > a) {
		ll tmp = b;
		b = a;
		a = tmp;
	}
	if (a%b == 0)return b;
	else return gcd(b, a%b);
}

ll inv(ll x,ll power) {
	ll res = 1;
	ll k = power;
	ll y = x;
	while (k) {
		if (k & 1)res = (res*y) % N;
		y = (y%N*y%N) % N;
		k /= 2;
	}
	return res;
}

int main(void){
    string s;
    cin>>s;
    vector<char>ans;
    reverse(s.begin(),s.end());
    for(int i=1;i<=s.length();i++){
        if(i%3==0){
            ans.push_back(s[i-1]);
            if(i!=s.length())ans.push_back(',');
        }
        else ans.push_back(s[i-1]);
    }
    reverse(ans.begin(),ans.end());
    for(int i=0;i<ans.size();i++){
        cout<<ans[i];
    }
    cout<<endl;
    return 0;
}