/**
 *  author:   TakeruOkuyama
 *  created:  2020-04-09 14:53:46
**/
#include <bits/stdc++.h>
#define rep(i, n) for(int i = 0; i < (n); i++)
using namespace std;
using ll = long long;
using P = pair<int, int>;

int main(){
    string N;
    cin >> N;
    rep(i, N.size()){
        if(i + 1 != N.size()){
            if((i + 1) % 3 == 0){
                cout << N[i] << ","; 
            }else{
                cout << N[i];
            }
        }else{
            cout << N[i];
        }
    }
    cout << endl;
return 0;}

/**
**/