1 import java.io.BufferedReader;
 2 import java.io.IOException;
 3 import java.io.InputStreamReader;
 4 
 5 public class Main {
 6     public static void main(String[] args) throws IOException {
 7         BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
 8         String[] str = br.readLine().split(" ");
 9         int n = Integer.parseInt(str[0]);
10         int m = Integer.parseInt(str[1]);
11         
12         int[][] num = new int[n][m];
13         for(int i = 0; i < n; i++){
14             String[] t = br.readLine().split(" "); 
15             for(int j = 0; j < m; j++){
16                 num[i][j] = Integer.parseInt(t[j]);
17             }
18         }
19         
20         int[] memory = new int[n*m];        //存储每一步取到的数
21         loopGetNum(n,m,num,memory);
22         
23         for(int i = 0; i < memory.length; i++){
24             System.out.print(memory[i]+" ");
25         }
26         
27     }
28 
29     private static void loopGetNum(int n, int m, int[][] num, int[] memory) {
30         int row = 0;          //行
31         int col = 0;          //列
32         int cirNum = 0;       //圈数
33         int total = n * m;    //总的执行次数，即数字的总个数
34         
35         for(int i = 0; i < total; i++){
36             if(row < n && col == cirNum){                //第一列
37                 memory[i] = num[row][col];
38                 row++;
39             }else if(row == n && col < m-1){            //最后一行
40                 col++;
41                 memory[i] = num[row-1][col];
42             }else if(row-1 > cirNum && col == m-1){        //最后一列
43                 row--;
44                 memory[i] = num[row-1][col];
45             }else if(row-1 == cirNum && col > cirNum){    //第一行
46                 col--;
47                 memory[i] = num[row-1][col];
48                 if(row-1 == cirNum && col == cirNum+1){    //若到第一行第二个数字，则缩小矩阵行列范围，形成子矩阵
49                     cirNum++;
50                     n = n-1;
51                     m = m-1;
52                     row = cirNum;
53                     col = cirNum;
54                 }
55                 
56             }
57         }
58     }
59 }