#include<bits/stdc++.h>
using namespace std;
int main(){
	int a[110][110]={0},n,m,i,j;
	cin>>n>>m;
	for(i=0;i<n;i++){
		for(j=0;j<m;j++){
			cin>>a[i][j];
		}
	}
	for(i=0;i<n;i++){
		for(j=0;j<m;j++){
			if(i>=1 and j>=1 and i<n-1 and j<m-1){
				if(a[i-1][j]<a[i][j] and a[i+1][j]<a[i][j] and a[i][j-1]<a[i][j] and a[i][j+1]<a[i][j]){
					cout<<a[i][j]<<endl;;
				}
			}
		}
	}
}
/**************************************************************
	Problem: 1384
	User: lvrenxiang
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/