package test.demo;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;

public class Yukicoder784 {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc=new Scanner(System.in);
		int N =sc.nextInt();
		if(N>999) {
			String str=String.valueOf(N);
			int a=str.length()%3;
		if(a!=0) {	
			String str2=str.substring(0,a)+",";
			for(int i=a;i<str.length()-a;i=i+3) {
				if(i+3>=str.length()) {
					str2+=str.substring(i,str.length());
				}else {
				str2+=str.substring(i,i+3)+",";
				}
		}
			System.out.println(str2);
		}else {
			String str2="";
			for(int i=0;i<str.length();i=i+3) {
				if(i+3>=str.length()) {
					str2+=str.substring(i,str.length());
				}else {
				str2+=str.substring(i,i+3)+",";
				}
			}
			System.out.println(str2);
		}
			
		}else {
			System.out.println(N);
		}

	}

}