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

// The main method must be in a class named "Main".
class Main {
    public static void main(String[] args) {
        int[] arr = {10,20,30,40,50};
        for(int i=0;i<arr.length;i++){
            System.out.println(arr[i]);
        }
         for(int i=arr.length-1;i>=0;i--){
            System.out.println(arr[i]);
        }
    }
}