#include<cstdio>
#include<cstdlib>
#include<algorithm>
#include<iostream>
#include<queue>
#include<vector>
#include <bitset>
#include <cmath>
#include <limits>
#include <iostream>
using namespace std;
#define INF 100000
#define MAX 100000
#define MOD 1000000007
typedef long long ll;
typedef pair<int,int> P;
typedef pair< pair<int,int>, int> p; 
#define bit(n,k) ((n>>k)&1) /*nのk bit目*/
#define rad_to_deg(rad) (((rad)/2/M_PI)*360)

int main(){
    string S;
    cin>>S;
    vector<char> V;
    for(int i=S.size()-1;i>=0;i--){
        int n=S.size()-1-i;
        if(n%3==0 && n!=0){
            V.push_back(',');
        }
        V.push_back(S[i]);
    }
    for(int i=V.size()-1;i>=0;i--){
        cout<<V[i];
    }
    cout<<endl;
}