import java.util.Scanner;
import java.util.ArrayList;

public class A4 {

	public static void main(String[] args) {
	Scanner sc = new Scanner(System.in);

	String string = sc.next();
	String output = "";
	string = string.toLowerCase();
	ArrayList<Character> strArray = new ArrayList<Character>();
		for(int x = 0; x <= string.length() - 1 ; x++){
			char temp = string.charAt(x);
			if(temp != 'a' && temp != 'o' && temp != 'y' && temp != 'e' && temp != 'u' && temp != 'i')
				strArray.add(temp);
		}
		for(int x = strArray.size() - 1; x >= 0 ; x--)
			strArray.add(x, '.');
		for(int x = 0; x <= strArray.size() - 1; x++){
			char temp = strArray.get(x);
			output += temp;
		}

	System.out.println(output);

	}
}