// Program 68: Sentence Length and Alphabetical Word Order

import java.util.*;
class AlphabeticalWords {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine().trim();
        if (!s.matches("[A-Z]+( [A-Z]+)*[.?!]")) {
            System.out.println("INVALID SENTENCE");
            return;
        }
    String body = s.substring(0, s.length() - 1);
    String[] words = body.split(" ");
    Arrays.sort(words);
    System.out.println("LENGTH = " + words.length);
    System.out.println("REARRANGED SENTENCE:");
    System.out.println(String.join(" ", words));
}
}