internal class Program
    {
        private const int N = 12;

        private static void Main()
        {
            var matrix = new int[N, N];
            var rand = new Random();
            for (var i = 0; i < N; i++)
                for (var j = 0; j < N; j++)
                    matrix[i, N - j - 1] = i <= j ? 0 : rand.Next(1, 9);

            for (var i = 0; i < N; i++)
            {
                for (var j = 0; j < N; j++)
                {
                    if (matrix.Length > N - j - 1)
                        matrix[i, N - j - 1] = i <= j ? 0 : rand.Next(1, 9);
                    Console.Write(matrix[i, j] + " ");
                }
                Console.WriteLine();
            }
            Console.WriteLine();
            for (var i = 0; i < N; i++)
            {
                for (var j = 0; j < N; j++)
                {
                    Console.Write(matrix[j, i] + " ");
                }
                Console.WriteLine();
            }
        }
    }