package exercise;

import java.util.*;

public class tema2task11 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        Map<Integer, List<Integer>> map = new LinkedHashMap<>();
        String[] data = scanner.nextLine().split("\\s+");

        int[][] matrix = new int[Integer.parseInt(data[0])][Integer.parseInt(data[1])];
        //TODO fulfill the matrix
        for (int i = 0; i <matrix.length ; i++) {
            int[] current = Arrays.stream(scanner.nextLine().split("\\s+"))
                    .mapToInt(Integer::parseInt).toArray();
            matrix[i]=current;
        }

        int wait =0 ;

        //TODO printing
        int group=0;
        int counter=0;
        for (int i = matrix.length-1; i >=0 ; i--) {
            int[] current = matrix[i];

            for (int j = current.length-1; j >=group ; j--) {
                int value = matrix[i][j];

                if(wait==0){
                    List<Integer> list = new ArrayList<>();
                    list.add(value);
                    map.put(counter,list);
                    counter++;
                }else{
                    List<Integer> list = map.get(counter);
                    list.add(value);
                    map.put(counter,list);
                    counter++;
                }

            }

            for (int j = matrix.length-1-1-group; j >=0 ; j--) {
                int[] curr = matrix[j];

                if (group >= curr.length) {

                    continue;

                }

                int value = curr[group];

                if(wait==0){
                    List<Integer> list = new ArrayList<>();
                    list.add(value);
                    map.put(counter,list);
                    counter++;
                }else{
                    List<Integer> list = map.get(counter);
                    list.add(value);
                    map.put(counter,list);
                    counter++;
                }


            }
            group++;
            counter=group;
            wait++;
        }

        map.entrySet().stream().forEach(entry->{
            List<Integer> list = map.get(entry.getKey());

            for (int n  :list) {
                System.out.print(n+" ");
            }
            System.out.println();

        });


    }
}