#include <bits/stdc++.h>
using namespace std;

int main(){
  string S;
  cin>>S;
  if(S.length()<=3){
    cout<<S<<endl;
    return 0;
  }
  if(S.length()<=6){
    cout<<S.substr(0,3)<<","<<S.substr(3,3)<<endl;
  return 0;
  }
  if(S.length()<=9){
    cout<<S.substr(0,3)<<","<<S.substr(3,3)<<","<<S.substr(6,3)<<endl;
  return 0;
  }  
  cout<<"1,000,000,000"<<endl;
  return 0;
}