using System;
using System.Numerics;

namespace MultidimensionArrays
{
 class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            //int[,] matrix = new int[3,3]
            //    {
            //         {1, 2, 3 },
            //         {4 ,5 ,6 },
            //         {7, 8, 9 }
            //    };
            int[,] matrix = new int[n, n];

            for (int i = 0; i < matrix.GetLength(0); i++)
            {
                for (int j = 0; j < matrix.GetLength(1); j++)
                {
                    matrix[i, j] = int.Parse(Console.ReadLine());
                }
            }
            int rows = 0;

            int counter = 0;

            for (int row = matrix.GetLength(0) - 1; row >= 0; row--)
            {
                rows = row;
                for (int col = 0; col <= counter; col++)
                {

                    Console.Write(matrix[rows, col] + " ");
                    rows++;
                }
                Console.WriteLine();
                counter++;
            }

            int cols = 1;

            for (int i = matrix.GetLength(0) - 2; i >= 0; i--)
            {

                for (int row = 0; row <= i; row++)
                {
                    Console.Write(matrix[row, cols] + " ");
                    cols++;
                }
                Console.WriteLine();
                cols--;

            }
        }
    }
}