import java.util.*;

public class Solution1{

public static void main(String args[]){

    Scanner scan=new Scanner(System.in);

    int size=scan.nextInt();

    int a[]=new int[size];

    for(int i=0;i<size;i++){

        a[i]=scan.nextInt();
    }
    for(int i=0;i<a.length;i++){

        if(i==a.length-1){

            System.out.print(a[i]+".");
        }
        else{
            System.out.print(a[i]+",");
        }
    }
    scan.close();
}

}