#include <iostream>


using namespace std;

int a[1001][1001], a2[1001][1001];
int n, m;

int main(){
 cin>>n;
cin>>m;

 for(int i=1;i<=n;i++)
   for(int j=1;j<=m;j++){
  cin>>a[i][j];
      }

 for(int k=0;k<=(n*m)/2;k++){
   for(int i=1+k;i<=m-k;i++) {int l=k+1; if(!a2[l][i]) cout<<a[l][i]<<" ", a2[l][i]=1;}
   for(int j=2+k;j<=n-k;j++) {int l=m-k; if(!a2[j][l]) cout<<a[j][l]<<" ", a2[j][l]=1;}
   for(int i=m-1-k;i>=1+k;i--) {int l=n-k; if(!a2[l][i]) cout<<a[l][i]<<" ", a2[l][i]=1;}
   for(int j=n-1-k;j>=2+k;j--) {int l=k+1; if(!a2[j][l]) cout<<a[j][l]<<" ", a2[j][l]=1;}
 }


 return 0;
}