#include <stdio.h>

/*0, 1, 2 //00 11 22 //02 11 20
3, 4, 5,
6, 7, 8
==> 0, 2, 4, 6, 8*/ 
    
int main() {
    int n = 0;
    int m = 0;
    scanf("%d %d",n, m);
    int arr[n][m];

    for(int i=0;i<n;i++){
        for(int j=0;j<m;j++){
            scanf("%d",arr[n][m]);//sud be &arr[i][j];
        }
    }

    for(int i=0;i<n;i++){
        for(int j=0;j<m;j++){
            if(n==m){
                printf("%d",arr[n][m]);
            }
        }
    }

    for(int i=0;i<n;i++){
        for(int j=m;j>=0;j--){
            if(m+n==2){
               printf("%d",arr[n][m])
            }
            
    }
}

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