#include <iostream>
#include <vector>
using namespace std;
  
int main() {
    int n, m;
    cin >> n >> m;
      
    vector<vector<int>> matrix(n, vector<int>(m));
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            cin >> matrix[i][j];
        }
    }
      
    // 检查内部元素（排除边缘）
    for (int i = 1; i < n - 1; i++) {
        for (int j = 1; j < m - 1; j++) {
            int current = matrix[i][j];
            if (current > matrix[i-1][j] && // 上方
                current > matrix[i+1][j] && // 下方
                current > matrix[i][j-1] && // 左方
                current > matrix[i][j+1]) {  // 右方
                cout << current << endl;
            }
        }
    }
      
    return 0;
}
/**************************************************************
	Problem: 1384
	User: linmiaoling
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2076 kb
****************************************************************/