import java.util.Scanner;
 
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Введіть рядок S (до 70 символів): ");
        String sInput = scanner.nextLine();
 
        if (sInput.length() > 70) {
            sInput = sInput.substring(0, 70);
        }
 
        String[] words = sInput.split(" ");
        StringBuilder s3 = new StringBuilder();
 
        for (String word : words) {
            if (word.length() > 0 && word.length() % 3 == 0) {
                s3.append(word).append(" ");
            }
        }
 
        System.out.println("\n--- Результати ---");
        System.out.println("Початковий рядок S: " + sInput);
        System.out.println("Рядок S3 (слова, кратні 3): " + s3.toString().trim());
 
        scanner.close();
    }
}

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