#include <iostream>
#include <math.h>

using namespace std;


/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main()
{
	int n,m,i,j,l;
	float p;

	cin>>n;
	cin>>m;
	int a[n][m];
	for(i=0;i<n;i++){
		for(j=0;j<m;j++){
			cin>>a[i][j];
			if(i==j){
				p=p+a[i][j];
				l++;
			}

		}
	}
	for(i=0;i<n;i++){
		for(j=0;j<m;j++)
		{
			cout <<a[i][j];
		}
		cout<<endl;
	}
	cout << endl;
	cout << p/l;
	return 0;
}