#include <stdio.h>

int main()
{
  int n = 9, x = 1;
  int i,j;
  
  for(i = 1; i <= n; i++)
  {
    for (j = 1; j <= x; j++)
    {
      printf("%2d ", j);
    }
    if (i <= n / 2)
      x++;
    else
      x--;
    printf("\n");
  }
  return 0;
}