import java.util.*;
class BeingZero {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long n = sc.nextLong();
        int arr[] = new int[(int)n];
        //Reading array elements
        for(int i=0;i<n;i++)
        {
            arr[i]= sc.nextInt();
        }
        //Print from 0 to n
        for(int ele : arr)
        {
            System.out.print(ele +" ");
        }
        System.out.println();
 
        //Print from n to 0
        int N = (int)n;
        for(int i = N-1;i>=0;i--)
        {
            System.out.print(arr[i]+" ");
        }
        System.out.println();
        //Print even index elements
        for(int i = 0;i<N;i=i+2) {
            System.out.print(arr[i]+" ");
        }
        System.out.println();
    }
 
}

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NQoxIDIgMyA0IDU=

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