/* 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
	{
 
	String st="4231354";
	String newString=st.substring(0,3)+"-"+st.substring(3,4)+"-"+st.substring(4,5)+"."+st.substring(5,st.length());
	System.out.println(newString);
	}
}

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