import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.Scanner;

public class Main {
    
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        
        System.out.print("Enter a sentence: ");
        String sentence = sc.nextLine();
        
        String[] words = sentence.split(" ");
        
        for (int i = 0; i < words.length; i++) {
            if (words[i].length() > 3) {
                words[i] = reverse(words[i]);
            }
        }
        
        for (int i = 0; i < words.length; i++) {
            System.out.print(words[i] + " ");
        }
    }
    
    public static String reverse(String word) {
        String rev = "";
        
        for (int i = word.length() - 1; i >= 0; i--) {
            rev = rev + word.charAt(i);
        }
        
        return rev;
    }
}