import java.util.Arrays;
import java.util.Scanner;


public class RailFence {

    public static void main(String[] args) {
        Scanner read=new Scanner(System.in);

        String plainText=read.next();
        int key=read.nextInt();

        char railFence[][]=new char[plainText.length()][key ];
        int currentCol = 0;
        boolean atBottom = false;
        /*
         *  We maintain track of current column while traversing rows
         *  and whether it has touched bottom column or not,
         *  in case current column has touched bottom we have to decrement
         *  current column else increment.
         *
         *  Every time the current column is 0, atBottom is marked as false,
         *  we will increment the column index. when it reaches Last Column
         *  we will mark it true, then decrement the column index
         */
        for (int i = 0; i < plainText.length(); i++) {
            //update flag - either it has touched bottom or top
            if(currentCol == (key - 1))
                atBottom = true;
            else if(currentCol == 0)
                atBottom = false;

            //update value
            railFence[i][currentCol] = plainText.charAt(i);

            //update current column, in case it hasn't touched the
            //bottom then increment otherwise ( the currenCol has reached
            // bottom) decrement it.
            if(atBottom == false){
                currentCol ++;
            } else {
                currentCol --;
            }
        }

        // Store the result
        StringBuilder result = new StringBuilder();

        // simply pick up all the non-empty values, while traversing each row.
        // this would be the required CipherText
        for (int i = 0; i < key; i++) {
            for (int j = 0; j < plainText.length(); j++) {
                char res = railFence[j][i];
                if((int)res != 0){
                    result.append(res);
                }
            }
        }

        System.out.println(result.toString());


        // prints the RailFence
        for (int i = 0; i < plainText.length(); i++) {
            for (int j = 0; j < key; j++) {
                System.out.print(railFence[i][j] + " ");
            }
            System.out.println("");
        }

    }
}