/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		boolean z=false;
		for(int i=2;i<1000;i++){
			boolean x=true;
			for(int s=2;s<i;s++){
				if(i%s<1){
					x=false;
				}
			}
			if(x)System.out.print(z?":"+i:i);
			z=true;
		}
	}
}