using System;

public class Program

{

    public static void Main()

    {

        Resolve("a b c d");

    }

    public static void Resolve(string line){

        string[] s = line.Split(' ');

        int width = Convert.ToInt16(Math.Sqrt(s.Length));//Get the width of the matrix

        string[,] arr = new string[width,width];

        //Push the elements to two dimentional array

        for(var i = 0; i < arr.GetLength(0); i++){

            for(var j = 0; j < arr.GetLength(1);j++){

                arr[i,j] = s[i + j];

            }

        }

        //Traverse the array close-wise - Right -> Down -> Left -> Up

        // i++ -> j++ -> i-- -> j--

        Traverse(arr, width);

    }

    public static void Traverse(string[][] arr, int width){

        for(var m = 0; m < width; m++){

            Console.Write(arr[m][0] + " ");

        }

        for(var n = 0; n < width; n++){

            Console.Write(arr[1][n] + " ");

        }

        for(var m = 1; m >= 0 ; m--){

            Console.Write(arr[m][0] + " ");

        }

        for(var n = 1; n >= 0; n--){

            Console.Write(arr[n][0] + " ");

        }

    }

}