#include <stdio.h> 
#include <conio.h>
 int M ;  
int N ;  

main() 
{ 
 scanf ("%d%d", &M, &N); 
   int i, j, A[M][N]; 
    
   for ( i = 0; i < M; i ++ )       
    for ( j = 0; j < N; j ++ )     
        {
             printf ("A[%d][%d]=", i, j);  
  scanf ("%d", & A[i][j]);      
        } 
  printf("Glavnaya diagonal:\n"); 
for ( i = 0; i < N; i ++ ) 
printf ("%d ", A[i][i]); 


    getch();
}