import java.util.Scanner;

public class Main {

	public static void cutLog(String log) {

		String logPieces[] = log.split("X");

		int length =0;
		for (int i = 0; i < logPieces.length; i++) {
			if (logPieces[i].equals("")) {

			} else {
				length ++;
			}

		}
		System.out.println(length);

		for (int i = 0; i < logPieces.length; i++) {
			if (logPieces[i].equals("")) {

			} else {
				System.out.println(logPieces[i]);
			}

		}

	}

	public static void main(String[] args) {
		int logLength;
		String log;

		Scanner input = new Scanner(System.in);
		System.out.print("");
		logLength = input.nextInt();
		System.out.print("");
		Scanner input2 = new Scanner(System.in);
		log = input2.nextLine();
		System.out.print("");

		cutLog(log);

	}

}