X-shape in 2D matrics

import java.util.*;

public class Main {
    public static void main(String[] args) {
      Scanner input=new Scanner(System.in);
      int n=input.nextInt();
      int m=input.nextInt();
      int a[][]=new int [n][m];
      for(int i=0;i<n;i++){
        for(int j=0;j<m;j++){
          a[i][j]=input.nextInt();
        }
      }
      for(int i=0;i<n;i++){
        for(int j=0;j<m;j++){
          if(i==j){
            System.out.print(a[i][j]+" ");
          }else if((i+j)==n-1){
            System.out.print(a[i][j]+" ");
          }else{
            System.out.print("  ");
          }
          
        }
        System.out.println();
      }
  }
}