using System;
using System.Collections.Generic;
using System.Linq;

namespace P05SnakeMoves
{
    class Program
    {
        static void Main(string[] args)
        {

            int[] dimensions = Console.ReadLine()
                .Split(" ", StringSplitOptions.RemoveEmptyEntries)
                .Select(int.Parse)
                .ToArray();

            int rows = dimensions[0];
            int cols = dimensions[1];

            string input = Console.ReadLine();
            int snakeLength = input.Length;

            var matrix = new string[rows, cols];
            var queue = new Queue<char>(input);


            for (int i = 0; i < rows; i++)
            {
                for (int j = 0; j < cols; j++)
                {
                    char currentSymbol = queue.Peek();
                    matrix[i, j] = currentSymbol.ToString();

                    queue.Enqueue(queue.Dequeue());

                }
            }

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

        }
    }
}