import java.util.Scanner;
public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); String str = scanner.next(); int i=str.length()%3;
for(int j =0;j<str.length();j++){
if(str.length()<=3){
System.out.println(str);
break;
}
else if(i==0){
System.out.print(str.charAt(j));
if(j%3==2&&j!=str.length()-1)System.out.print(",");
}else if(i==1){
System.out.print(str.charAt(j));
if(j%3==0&&j!=str.length()-1)System.out.print(",");
}else if(i==2){
System.out.print(str.charAt(j));
if(j%3==1&&j!=str.length()-1)System.out.print(",");
}
}
}
}